CN1774115A - Cell reselecting method during concentrate mobile station residing concentrate laminated network - Google Patents
Cell reselecting method during concentrate mobile station residing concentrate laminated network Download PDFInfo
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Abstract
A method for reselecting cell when cluster mobile station is resided in with cluster superposed network includes setting system information and BA3 table format containing cluster adjacent zone information, sending BA3 table to cluster mobile station by cluster station subsystem through system information, searching BA3 table first and obtaining cluster adjacent zone cell reselecting parameter when cluster mobile station is resided in with cluster superposed network, calculating reselection object cell according to obtained reselection parameter, switching over cluster mobile station to said object cell for residing if cell reselection condition is satisfied.
Description
Technical field
The present invention relates to the communication technology, method of cell reselection when being specifically related to a kind of concentrate mobile station residing concentrate laminated network.
Background technology
Trunking communication with its flexibly packet scheduling, the fast speed that continues, secret Speech Communication, intelligence network management, spectrum utilization and good technical advantages such as resource-sharing are generally accepted by people efficiently, and with its main means as the radio communication command scheduling.Because GSM (global system for mobile communications) public mobile network towards the public, its group service that provides is relatively deficienter; Add that GSM producer equipment is numerous, each equipment supports that the gsm protocol version is inconsistent, can't provide GSM the basic cluster voice dispatching business of up-to-date agreement regulation by the unification of edition upgrading mode.Along with the demand of group customer to colony dispatching service strengthens, the GSM public network is difficult to satisfy the demand of group customer.
Along with network, development of Communication Technique, at present can be by on the existing public network of GSM, providing one deck cluster overlay network, utilize a chrp and different mobile management, private network and public network are merged, promptly no longer significantly distinguish the communication of cluster specific schedule and public's cellular communication system, and the colony dispatching function is merged wherein, make the place of cluster mobile station in the covering of cluster overlay network, reside in the cluster overlay network, can use group service; In the place that the cluster overlay network does not cover, reside in the GSM public network, use the service of GSM public network.Thereby make this cluster overlay network that the colony dispatching service of specialty both can be provided for cluster user well; for example: voice group call service, voice broadcast service, functional addressing, position-based route, lag enter, group calling keeps, dynamically marshalling, group state show, group calling merges, comprise callings, careful monitoring, ambience listening, distant open distantly close, regional selection, Priority Call, pre-occupied priority call, call blocking, control transfer, cipher key remote destroying, open channel calling etc., the while can be protected the investment of operator again well.
In gsm system, being implemented as follows of cell selecting: can get in touch with the GSM net of ownership after the mobile platform started, select a proper cell, therefrom extract the parameter and the other system message of control channel, finish the cell selecting process.In the GSM standard, what stipulated cell selecting is path loss criterion C1 according to parameter, C1=(RXLEV-RXLEV_ACCESS_MIN)-Max (MS_TXPWR_CCH-P, 0), and wherein, RXLEV is the mobile phone received signal level; P is a mobile phone maximal received power at the same level; ACCESS-MIN is that mobile phone inserts minimum incoming level; The maximum transmission power that MS-TXPWR-CCH allows for the mobile phone access control channel; The C1 value has reflected the quality of mobile phone incoming level, and networking mode is to the not influence of value of C1.The C1 value of the selected sub-district of travelling carriage must be greater than 0, also will judge whether the be under an embargo factors such as priority of access, sub-district of sub-district simultaneously, and under the prerequisite that satisfies the C1 standard, mobile phone will be selected the high sub-district of priority.
After travelling carriage is finished cell selecting, enter idle mode state, carry out the sub-district gravity treatment.Cell reselection process is as follows:
Under idle pulley, mobile phone rests in the selected sub-district, by receiving the system message of this sub-district, detects BA (Broadcast Control Channel frequency point allocation table) tabulation, and the BA table comprises the GSM neighboring BS information.Measure the signal level of BCCH (Broadcast Control Channel) carrier frequency of neighbor cell in this tabulation, write down wherein 6 neighbor cells of signal level maximum, and therefrom extract the sorts of systems message and the control messages of each neighbor cell, when meeting some requirements (mainly being quality of wireless channel etc.), travelling carriage will be transferred to another sub-district from current area, promptly finish the process of sub-district gravity treatment.Because the influences such as multipath effect of radio wave transmissions, as you were even travelling carriage is positioned at, the relative situation of its incoming level also can constantly change, and therefore also can cause the sub-district gravity treatment.
On GSM and cluster overlay network, when the resident cluster of cluster mobile station sub-district is in idle condition, also need notification channel is monitored, if find the group calling notice that this cluster mobile station is supported, then enter the group calling receiving mode, enter this module after, begin to carry out the sub-district gravity treatment.Therefore, after cluster mobile station is finished the resident cluster of cluster cell selecting sub-district, in idle condition, perhaps enter the group calling receiving mode after, all need to begin the sub-district gravity treatment.
The flow process of carrying out the sub-district gravity treatment behind the concentrate mobile station residing concentrate laminated network is as shown in Figure 1:
After the sub-district gravity treatment began, cluster mobile station received neighboring area signal by the BA table and measures, and the BA table comprises GSM public network adjacent area and cluster neighboring BS information.When travelling carriage was in idle condition, the BCCH channel of monitoring adjacent cell and reception were from the system message of these channels, and the BA1 table sends on the BCCH channel by system message 2, system message 2bis and system message 2ter; After travelling carriage enters the group calling receiving mode, the descending SACCH (slow associated control channel) of monitoring TCH (voice channel) and reception are from the system message of these channels, and the BA2 table sends on the descending SACCH of TCH by system message 5, system message 5bis, system message 5ter.Then, according to BA1 table that receives or BA2 table neighboring area signal intensity is sorted, synchronously and obtain system message 3 or the system message 4 (being system message 3, is system message 4 during the group calling receiving mode) that the strongest non-service area BCCH carrier frequency of preceding 6 signals sends when idle condition.For multi-frequency mobile phone, the peak signal carrier frequency may be in different frequency ranges.Know neighbor cell selection priority and sub-district gravity treatment state according to system message 3 or system message 4, then according to the C2 algorithm, travelling carriage will be selected the maximum sub-district of C2 value when doing the sub-district gravity treatment.
According to the GSM standard, the computing formula of C2 is as follows:
(1) when Penalty time ≠ 11111, C2=C1+CRO-TO * H (PT-T);
(2) when Penalty time=11111, C2=C1-CRO.
Wherein, when X＞0, function H (x)=0; When X≤0, function H (x)=1.
The quality of C1 reflection wireless channel, the big more explanation channel quality of C1 is good more, and CRO then is the parameter that is used for artificially revising C2.
Each parameter declaration is as follows in the following formula:
T is a timer, its initial value is 0, when certain sub-district is moved platform and is recorded in 6 adjacent areas of signal level maximum, then counter T that should the sub-district is picked up counting, when removed from 6 adjacent areas of mobile station signal level maximum this sub-district, corresponding timer T was reset;
CRO is a sub-district gravity treatment amount of bias, can artificially adjust the C2 value by this parameter;
TO is interim value amount partially;
PT is a Penalty time, find the signal appearance of a certain sub-district from travelling carriage after, timer T begins set, to give the correction of a negative bias of C2 algorithm of this sub-district according to the defined value of TO before the value of timer T arrives the PT official hour, this way is to be used for preventing selecting a microcellulor or covering the situation of less sub-district as Serving cell during in fast moving when travelling carriage.Otherwise,, will not consider interim amount of bias if the time has surpassed PT after the defined time.Can use Penalty time to avoid frequent sub-district gravity treatment at areas of coverage such as highways.
When following situation takes place, with the triggering cell gravity treatment:
(1) the travelling carriage C2 value of calculating certain sub-district (belonging to same lane place with current area) surpasses continuous 5 seconds of the C2 value of travelling carriage current service cell;
(2) the travelling carriage C2 value of calculating certain sub-district (not belonging to same lane place with current area) surpassed the C2 value of travelling carriage current service cell and sub-district gravity treatment lagged value sum continuous 5 seconds;
(3) current service cell is under an embargo;
(4) travelling carriage is monitored out downlink failure;
(5) continuous 5 seconds of the C1 value of Serving cell is less than 0.
On GSM public network and integrated overlay network, its application has following characteristics:
Cluster overlay network sub-district has Da Qu system characteristics usually, and often several kilometers even tens kilometers of the covering radiuss of cluster sub-district make the cluster sub-district have very wide coverage usually; And because the sub-district system characteristics of GSM public network cell, big city hot zones public network cell radius is often less than one kilometer, therefore, the covering edge in the cluster sub-district, the signal strength signal intensity of peripheral cell GSM public network cell is generally greater than the cluster cell signal strength.
Because the cluster overlay network is identical with the GSM system essentially, its cell re-selection mechanism is also identical: carry out the sub-district gravity treatment according to signal strength signal intensity.According to the gsm system agreement and be subjected to the restriction of travelling carriage bottom ability, travelling carriage only can receive 6 peak signal adjacent area sub-district gravity treatment system messages usually.In the coverage of cluster Da Qu system sub-district, there is not the possibility of cluster sub-district bigger in 6 peak signal adjacent areas, according to the above-mentioned cell re-selection mechanism of gsm system travelling carriage, the gravity treatment of travelling carriage sub-district often can not reselect to cluster overlay network sub-district, therefore, the travelling carriage overwhelming majority time can only reside in the GSM public network cell, and the GSM public network cell can only provide public service, can't provide the cluster overlay network powerful group service, this original intention with design cluster overlay network deviates from.
This shows that though the mode that adopts this cluster overlay network has also reduced the investment of operator simultaneously for cluster user provides service more easily, the gsm system cell re-selection mechanism can not the fine sub-district gravity treatment problem that solves GSM public network and cluster overlay network.
Summary of the invention
Method of cell reselection when technical problem to be solved by this invention provides a kind of concentrate mobile station residing concentrate laminated network, can not reside in shortcoming in the cluster overlay network for a long time to overcome cluster mobile station in the prior art, under the prerequisite that does not promote cluster mobile station bottom performance requirement, realize preferential selection to the cluster adjacent area.
For this reason, the invention provides following technical scheme:
Method of cell reselection during a kind of concentrate mobile station residing concentrate laminated network, described cluster overlay network comprises the trunked base station subsystem, comprising:
A, initialization system message 21 and BA3 tableau format, described BA3 table comprises the cluster neighboring BS information;
B, described trunked base station subsystem send the BA3 table by described system message 21 to described cluster mobile station;
The described BA3 of first search shows and obtains cluster adjacent area cell reselection parameters when C, described concentrate mobile station residing concentrate laminated network;
D, calculate the gravity treatment Target cell according to the described cluster adjacent area cell reselection parameters of obtaining;
E, when satisfying the sub-district reselection conditions, described cluster mobile station is transformed in the described Target cell resident.
Described step B comprises:
B1, when described cluster mobile station is in idle pulley, described trunked base station subsystem sends BA1 table and BA3 table simultaneously on the Broadcast Control Channel of cluster sub-district, wherein, described BA1 table sends by system message 2, and described BA3 table sends by system message 21;
B2, when described cluster mobile station is in the group calling receiving mode, described trunked base station subsystem sends BA2 table and BA3 table simultaneously on the slow associated control channel of cluster sub-district, wherein, described BA2 table sends by system message 5, and described BA3 table sends by system message 21.
Described step C comprises:
C1, described cluster mobile station carry out neighboring area signal according to described BA3 table and measure;
C2, obtain system message 3 or system message 4 that described BA3 shows preceding 6 cluster adjacent areas;
C3, obtain cluster adjacent area cell reselection parameters according to described system message 3 or system message 4.
Described system message 3 and system message 4 comprise respectively: cluster cell ID, cluster sub-district access barred sign, cluster sub-district access barred allow sign.
Described step C3 comprises:
C31, obtain cell selecting priority and the sub-district gravity treatment state that described BA3 shows preceding 6 cluster adjacent areas according to described system message 3 or system message 4;
C32, cell selecting priority and the sub-district gravity treatment state of showing preceding 6 cluster adjacent areas according to the described BA3 that obtains are determined cluster adjacent area cell reselection parameters.
Described step D comprises:
D1, calculate the C2 value of described 6 adjacent areas as follows;
When Penalty time ≠ 11111, C2=C1+GT_FLAG * GT_CRO+CRO-TO * H (PT-T);
When Penalty time=11111, C2=C1+GT_FLAG * GT_CRO-CRO;
Wherein, when X＞0, function H (x)=0; When X≤0, function H (x)=1;
C1 is the wireless channel parameter of the current resident cluster sub-district of described cluster mobile station;
CRO is sub-district gravity treatment biasing;
TO is interim biasing;
PT is a Penalty time;
T is a timer, when described cluster mobile station measures this sub-district when being the adjacent sub-district of level value maximum, calculates since 0;
For cluster suitable cell, GT_FLAG=1; For GSM public network cell and non-cluster suitable cell, GT_FLAG=0;
GT_CRO is preferably to setover in the cluster sub-district;
D2, adjacent area that C2 value in described 6 adjacent areas is maximum are as the gravity treatment Target cell.
Described sub-district reselection conditions comprises:
(1) described cluster mobile station calculates certain sub-district C2 value of belonging to same lane place with described current resident cluster sub-district above continuous 5 seconds of the C2 value of the current resident cluster of described cluster mobile station sub-district;
(2) described cluster mobile station calculates certain sub-district C2 value that described current resident cluster sub-district belongs to same lane place and surpassed the C2 value of the current resident cluster of described cluster mobile station sub-district and sub-district gravity treatment lagged value sum continuous 5 seconds;
(3) current resident cluster sub-district is under an embargo;
(4) described cluster mobile station is monitored out downlink failure;
(5) continuous 5 seconds of the C1 value of described current resident cluster sub-district is less than 0.
By above technical scheme provided by the invention as can be seen, the present invention is by on existing gsm protocol basis, by increasing system message 21, make it on the BCCH channel and at the descending SACCH of group calling TCH (voice channel) (slow associated control channel), go up the BA3 table that transmission only comprises the cluster neighboring BS information, make the cluster mobile station preferential BA3 of selection table when idle mode state or group calling receiving mode state.Like this, when cluster mobile station gravity treatment Target cell, just can make the cluster adjacent area have precedence over the GSM adjacent area.
In addition, by expanding the sign in original system message 3 and the system message 4, whether increase is cluster cell ID, cluster sub-district access barred sign, cluster sub-district access permission sign, its BCCH in the cluster sub-district (Broadcast Control Channel) is gone up transmission, make cluster mobile station can learn the type of neighbor cell according to these signs.Thereby,, can obtain cell reselection parameters according to the sign in BA3 table and system message 3 or the system message 4.
Like this, when cluster mobile station is in group calling receiving mode state or idle mode state, as long as there is the suitable adjacent area of cluster in periphery, just can guarantee that cluster mobile station resides at the cluster stacking network in moving process, avoid the GSM public network cell obtaining the group service that the cluster overlay network provides to greatest extent as the gravity treatment Target cell.Avoided lifting simultaneously, can make cluster mobile station realize competition in a wider context, promoted cluster overlay network solution and based on the competitiveness of GSM system group system to the bottom performance requirement of cluster mobile station.
Description of drawings
Fig. 1 is the flow chart that carries out the sub-district gravity treatment in the prior art behind the concentrate mobile station residing concentrate laminated network;
State change process schematic diagram when Fig. 2 is the resident cluster of cluster mobile station sub-district;
Fig. 3 is the flow chart of the inventive method.
Embodiment
Core of the present invention is based on gsm protocol, on existing GSM and cluster overlay network, increase system message 21, and on BCCH (Broadcast Control Channel) channel and at the descending SACCH of group calling TCH (transmission channel) (slow associated control channel), go up the BA3 table that transmission only comprises the cluster neighboring BS information by this message.By measuring the descending level of BA3 cluster adjacent area frequency tabulation sub-district BCCH, and carry out the cluster adjacent area according to channel strength and sort, receive the system message 3 or the system message 4 of 6 peak signal cluster adjacent areas, whether by increasing in original system message 3 and system message 4 is cluster cell ID, cluster sub-district access barred sign, cluster sub-district access permission sign, and it is sent on the BCCH of cluster sub-district, make cluster mobile station can learn the type of neighbor cell according to these signs, determine sub-district gravity treatment state, thereby obtain sub-district gravity treatment relevant parameter.Carry out the sub-district gravity treatment according to the sub-district reselection criterion then.
The present technique field personnel know, on GSM and cluster overlay network, when the resident cluster of cluster mobile station sub-district is in idle condition, also need notification channel is monitored, if find the group calling notice that this cluster mobile station is supported, then enter the group calling receiving mode, enter this pattern after, begin to carry out the sub-district gravity treatment.Therefore, after cluster mobile station is finished the resident cluster of cluster cell selecting sub-district,, all need to begin the sub-district gravity treatment in idle condition or after entering the group calling receiving mode.
After the sub-district gravity treatment began, cluster mobile station received neighboring area signal by the BA table and measures, and the BA table has comprised the information of GSM public network adjacent area and cluster adjacent area.When travelling carriage was in idle condition, the BCCH channel of monitoring adjacent cell and reception were from the system message of these channels, and the BA1 table sends on the BCCH channel by system message 2, system message 2bis and system message 2ter; After travelling carriage enters the group calling receiving mode, monitor the descending SACCH (slow associated control channel) of TCH (voice channel) and receive the system message of locating these channels, the BA2 table sends on the descending SACCH of TCH by system message 5, system message 5bis, system message 5ter.Then, according to BA1 table that receives or BA2 table neighboring area signal intensity is sorted, synchronously and obtain system message 3 or the system message 4 (being system message 3, is system message 4 during the group calling receiving mode) that the strongest non-service area BCCH carrier frequency of preceding 6 signals sends when idle condition.Know neighbor cell selection priority and sub-district gravity treatment state according to system message 3 or system message 4, then according to the C2 algorithm, travelling carriage will be selected the maximum sub-district of C2 value when doing the sub-district gravity treatment.
Because in existing GSM standard, BA1 table and BA2 table have comprised GSM public network adjacent area and cluster neighboring BS information.And since GSM public network and the application of cluster overlay network, the covering edge in the cluster sub-district, and the signal strength signal intensity of peripheral cell GSM public network cell is generally greater than the cluster cell signal strength.Therefore, when carrying out the sub-district gravity treatment, can preferentially choose adjacent cluster sub-district in order to make cluster mobile station, and be unlikely to choose the stronger GSM public network cell of signal, the present invention has increased adjacent area, cluster sub-district table BA3, this table only comprises the cluster neighboring BS information, mainly is the frequency point information at the bcch carrier place of cluster adjacent area.Correspondingly, increase system message 21, send the BA3 table by this message.Be similar to the transmission of BA1 table and BA2 table, when concentrate mobile station residing concentrate laminated network is in idle pulley, send the BA3 table by system message 21 on the BCCH channel, at this moment, the form of system message 21 and system message 2 are similar; When being in the group calling receiving mode, send the BA3 table by system message 21 on the descending SACCH channel of group calling TCH channel, at this moment, the form of system message 21 and system message 5 are similar.Similar with system message 2 and system message 5, frequency range according to the BA3 table, the transmission of the BA3 table of some specified cluster sub-district may need a plurality of system messages, transmission as the BA2 table need be used system message 2, system message 2bis and system message 2ter, and the transmission of BA3 table also may need to use system message 21, system message 21bis and system message 21ter.
Like this, can preferentially receive the BA3 table during cluster mobile station gravity treatment Target cell, preferentially from the BA3 table, obtain the information of cluster adjacent area by system message 21.
Just obtain the frequency point information at bcch carrier place, cluster adjacent area according to BA3 table, but and do not known the priority and the sub-district gravity treatment state of each adjacent cluster sub-district.Therefore, only can't obtain cell reselection parameters fully according to the BA3 table, also need be in system message clear and definite cell type.Because the cluster overlay network is identical with the GSM system essentially, can't the distinguishing cell type by Cell Broadcast CB signal physical layer, can only in system message, identify.
In existing GSM standard, whether travelling carriage a resident GSM sub-district, and gsm protocol is by system message 3 and system message 4 signs.The sub-district access barred identifier CBA and the sub-district access barred permission identifier CBQ that have comprised gsm system in system message 3 and system message 4 form the cell selecting priority and the sub-district gravity treatment state of GSM sub-district by these two identifiers, and be as shown in table 1 below:
Table 1:
| Restriction (CBQ) is forbidden in the sub-district | (CBA) forbidden inserting in the sub-district | Cell selecting priority | Sub-district gravity treatment state |
| 0 | 0 | Normally | Normally |
| 0 | 1 | Forbid | Forbid |
| 1 | 0 | Low | Normally |
| 1 | 1 | Low | Normally |
In order to make in GSM and cluster overlapping network system, make cluster mobile station preferentially choose adjacent cluster sub-district, just need obtain the cell reselection parameters relevant with the cluster adjacent area.Therefore, the present invention has increased by three identifiers in system message 3 and system message 4 on the basis of said GSM standard: cluster cell identifier TCF, cluster sub-district access barred identifier T_CBA, cluster sub-district access barred permission identifier T_CBQ.Wherein, the CBA and the CBQ of T_CBA and T_CBQ and gsm system are similar, are used for the cell selecting priority and the sub-district gravity treatment state in identification sets group of mean people district, and be as shown in table 2 below:
Table 2:
| Restriction (CBQ) is forbidden in the cluster sub-district | (CBA) forbidden inserting in the cluster sub-district | Cluster cell selecting priority | Cluster sub-district gravity treatment state |
| 0 | 0 | Normally | Normally |
| 0 | 1 | Forbid | Forbid |
| 1 | 0 | Low | Normally |
| 1 | 1 | Low | Normally |
System message 3 and system message 4 send on the BCCH of cluster sub-district channel, receive for residing at the cluster mobile station that is in free time or group calling accepting state in the cluster sub-district.
Like this, when being in idle condition, notification channel is monitored,, then enter the group calling receiving mode, receive the BA3 table of this sub-district by the system message 21 of SACCH channel if find the group calling notice that this travelling carriage is supported in the resident cluster of cluster mobile station sub-district; If do not find the group calling notice that this travelling carriage is supported, then receive the BA3 table of this sub-district by the system message 21 of BCCH channel.Measure the descending level of BA3 cluster adjacent area frequency tabulation sub-district BCCH, and carry out the cluster adjacent area according to channel strength and sort, the system message 3 or the system message 4 that receive 6 peak signal cluster adjacent areas are obtained sub-district gravity treatment relevant parameter, by whether being that cluster cell identifier (TCF), cluster sub-district access barred identifier (T_CBA) and three signs of cluster sub-district access barred permission identifier (T_CBQ) are determined sub-district gravity treatment state in system message 3 or the system message 4, and carry out the sub-district gravity treatment according to the sub-district reselection criterion.
With to obtain the system message 3 that 6 non-service area BCCH the strongest send according to BA table in the prior art similar, the process that cluster mobile station obtains 6 peak signal cluster adjacent areas is as follows:
When cluster mobile station is in idle condition, on the BCCH channel, receive the BA3 table by system message 21, monitor the information of all specified BCCH carrier frequency of BA3 table then always, and at 5s to Max{5, the level to each BCCH carrier frequency that receives in ((5N+6)/7) the * BS_PA_MFRMS/4}s time averages.Wherein, BS_PA_MFRMS is number multiframe period, and N is the number of the BCCH carrier frequency of non-service cluster sub-district in the BA3 table.Each average received level is needed 5 level measurement samplings at least, and the value of average received level is often to upgrade.For resident cluster sub-district, each paging block of cluster mobile station is all carried out at least the sampling of an incoming level, the calculating of average received level with 5s to Max{5, the cycle of five continuous adjacent paging blocks of this travelling carriage } the level sampling value that received between s averages.
Whenever finish the measurement of an average received level and upgrade, the carrier frequency in the BCCH carrier frequency tabulation (BA3 table) of the non-service cluster sub-district that 6 level are the strongest also will upgrade once.
Cluster mobile station is at least every 30s attempt to have decoded once all BCCH data of resident cluster sub-district, and carrying in the strongest 6 the non-service cluster sub-district BCCH carrier frequency of level of decoding in 5 minutes at least influences the BCCH of cell reselection parameters data block.When cluster mobile station recognizes a new BCCH carrier frequency when having become one of 6 carrier frequency that level is the strongest, these BCCH carrier frequency data need decode in 30s.At least every 30s, cluster mobile station all will detect the BSIC (BCC) of the strongest non-service cluster sub-district BCCH carrier frequency of 6 level, is same sub-district with what confirm that it is monitored.If BSIC changes, this carrier frequency will be regarded as new carrier frequency, thereby read the BCCH data again.
Equally, when cluster mobile station is in the group calling accepting state, on the SACCH channel, receive the BA3 table by system message 21, to monitor the information of all specified SACCH carrier frequency of BA3 table then always, and at 5s to Max{5, the level to each SACCH carrier frequency that receives in ((5N+6)/7) the * BS_PA_MFRMS/4}s time averages, wherein, BS_PA_MFRMS is number multiframe period, and N is the number of the SACCH carrier frequency of non-service cluster sub-district in the BA3 table.Each average received level is needed 5 level measurement samplings at least, and the value of average received level is often to upgrade.For resident cluster sub-district, each paging block of cluster mobile station is all carried out at least the sampling of an incoming level, the calculating of average received level with 5s to Max{5, the cycle of five continuous adjacent paging blocks of this travelling carriage } the level sampling value that received between s averages.
Whenever finish the measurement of an average received level and upgrade, the carrier frequency in the SACCH carrier frequency tabulation (BA3 table) of the non-service cluster sub-district that 6 level are the strongest also will upgrade once.
Cluster mobile station is at least every 30s attempt to have decoded once all SACCH data of resident cluster sub-district, and carrying in the strongest 6 the non-service cluster sub-district SACCH carrier frequency of level of decoding in 5 minutes at least influences the SACCH of cell reselection parameters data block.When cluster mobile station recognizes a new SACCH carrier frequency when having become one of 6 carrier frequency that level is the strongest, these SACCH carrier frequency data need decode in 30s.At least every 30s, cluster mobile station all will detect the BSIC (BCC) of the strongest non-service cluster sub-district SACCH carrier frequency of 6 level, is same sub-district with what confirm that it is monitored.If BSIC changes, this carrier frequency will be regarded as new carrier frequency, thereby read the SACCH data again.
When satisfying certain condition, cluster mobile station will be reselected one of them cluster adjacent area as Serving cell, whether so-called certain condition may comprise multiple factor, be under an embargo such as: average received level size, the restriction of sub-district, the sub-district of collection adjacent area, prefecture and insert etc.
In the methods of the invention, during the gravity treatment of cluster mobile station sub-district, suitable adjacent area cell reselection priority is undertaken by following C2 criterion:
(1) when Penalty time ≠ 11111,
C2＝C1+GT_FLAG×GT_CRO+CRO-TO×H(PT-T)
(2) when Penalty time=11111,
C2＝C1+GT_FLAG×GT_CRO-CRO
Wherein, when X＞0, function H (x)=0; When X≤0, function H (x)=1.
The quality of C1 reflection wireless channel, the big more explanation channel quality of C1 is good more, and CRO then is the parameter that is used for artificially revising C2.
T is a timer, its initial value is 0, when certain sub-district is moved platform and is recorded in 6 adjacent areas of signal level maximum, then counter T that should the sub-district is picked up counting, when removed from 6 adjacent areas of mobile station signal level maximum this sub-district, corresponding timer T was reset;
CRO is a sub-district gravity treatment amount of bias, can artificially adjust the C2 value by this parameter;
TO is interim amount of bias;
PT is a Penalty time, find the signal appearance of a certain sub-district from travelling carriage after, timer T begins set, to give the correction of a negative bias of C2 algorithm of this sub-district according to the defined value of TO before the value of timer T arrives the PT official hour, this way is to be used for preventing selecting a microcellulor or covering the situation of less sub-district as Serving cell during in fast moving when travelling carriage.Otherwise,, will not consider interim amount of bias if the time has surpassed PT after the defined time.Can use Penalty time to avoid frequent sub-district gravity treatment at areas of coverage such as highways.
By the computing formula of above-mentioned C2 as seen, compare with the C2 algorithm that sub-district gravity treatment in the prior art gsm system is adopted, this algorithm is used preferred cluster adjacent area at GSM and cluster overlay network during specially for cluster mobile station sub-district gravity treatment has increased the italicized item in the formula.Wherein:
GT_FLAG represents whether be the sign of cluster sub-district, and for the cluster suitable cell, GT_FLAG is 1; For GSM public network cell and non-cluster suitable cell, GT_FLAG is 0;
GT_CRO is preferably to setover in the cluster sub-district, exist only in the travelling carriage, this amount of bias guarantees in the place that has the cluster sub-district to cover, the cluster sub-district will have precedence over other GSM public network cell as the gravity treatment Target cell, and GT_CRO will consider peak signal public network BCCH received signal and cross-location district sub-district reselection hysteresis here.
Because the BCCH CF signal of the gravity treatment Target cell that needs during the sub-district gravity treatment of cross-location district is stronger, by the decision of sub-district, cross-location district reselection hysteresis value, this is worth by the network side setting, sends to travelling carriage by system message 3 usually.Therefore, in order to guarantee preferred to the cluster adjacent area in diverse location district, GT_CRO need be set, the C2 value that makes it guarantee the cluster sub-district is also bigger than the maximum possible C2 value and sub-district, the cross-location district reselection hysteresis value sum of GSM public network cell.Between the cluster sub-district, because the C2 value of each cluster sub-district all has an identical GT_CRO increment, therefore, the existence of this amount of bias can not influence the ordering of C2 value between the cluster sub-district.Like this, according to above-mentioned formula, can guarantee that by increasing the cluster preferred bias GT_CRO in sub-district the cluster sub-district will have precedence over other GSM public network cell as the gravity treatment Target cell in the place that has the cluster sub-district to cover.
According to above-mentioned calculating to the C2 value, the sub-district gravity treatment triggering criterion of cluster mobile station, the sub-district gravity treatment triggering criterion that can still adopt GSM to define, specific as follows:
(1) the travelling carriage C2 value of calculating certain sub-district (belonging to same lane place with current area) surpasses continuous 5 seconds of the C2 value of travelling carriage current service cell;
(2) the travelling carriage C2 value of calculating certain sub-district (not belonging to same lane place with current area) surpassed the C2 value of travelling carriage current service cell and sub-district gravity treatment lagged value sum continuous 5 seconds;
(3) current service cell is under an embargo;
(4) travelling carriage is monitored out downlink failure;
(5) continuous 5 seconds of the C1 value of Serving cell is less than 0.
When satisfying above-mentioned sub-district gravity treatment triggering criterion, it is resident that cluster mobile station carries out the gravity treatment Target cell.When doing the sub-district gravity treatment, the maximum neighbor cell of C2 value will be selected.Then, repeat above-mentioned cell reselection process.If do not satisfy above-mentioned sub-district gravity treatment triggering criterion, then repeat aforementioned calculation and deterministic process.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with accompanying drawing.
With reference to Fig. 2, Fig. 2 shows the change procedure of the two states of cluster mobile station when resident cluster sub-district:
Cluster mobile station when resident cluster sub-district,
At first, in step 201: enter the resident idle pulley in sub-district;
Enter step 202: carry out notification channel and detect, i.e. the notification message of broadcasting on the detection notice channel, notification message is the message on a kind of the eating dishes without rice or wine, it comprises group calling or grouies busy group ID reference.
Then, enter step 203: judge whether to exist the group calling notice,, judge whether the group ID group calling notice that exists this travelling carriage to support promptly according to the notification message of broadcasting on the notification channel.
If there is no the group calling notice is then returned step 201: reenter the resident idle pulley in sub-district;
If have the group calling notice, then enter step 204: enter the group calling receiving mode;
Then, enter step 205: judge whether group calling finishes;
If finish, then return step 201: reenter the resident idle pulley in sub-district;
If also do not finish, then return step 204: reenter the group calling receiving mode.
With reference to Fig. 3, Fig. 3 shows the flow process of the inventive method, may further comprise the steps:
At first, in step 301: during the resident cluster of cluster mobile station sub-district, be in idle pulley or group calling receiving mode;
Enter step 302: carry out the measurement of cluster neighboring area signal by receiving the BA3 table.
The front is mentioned, and the BA3 table includes only the information of cluster adjacent area, sends by newly-increased system message 12.When cluster mobile station is in idle pulley, receive the BA3 table by the BCCH channel; Be in the group calling receiving mode at cluster mobile station, receive the BA3 table by the SACCH channel.Then, again according to the information of cluster adjacent area in this table, travelling carriage will be as early as possible synchronously and read the system message 4 that system message 3 that 6 the strongest non-service area BCCH carrier frequency of signal send or SACCH carrier frequency send.
Certainly, the base station is sending in the process of BA3 table to cluster mobile station, also can send the BA1 table to travelling carriage by system message 2, or send the BA2 table by system message 5 to travelling carriage.In the methods of the invention, cluster mobile station needs the preferential BA3 of reception table, only when not receiving the BA3 table, just can select BA1 table or BA2 table.
Therefore, enter step 303: the information according to the BA3 table sorts to adjacent cluster cell signal.
Then, enter step 304: preferentially obtain system message 3 or system message 4 that BA3 shows the strongest cluster adjacent area of preceding 6 signals.
System message 3 or system message 4 are that the trunked base station system sends on the BCCH channel of cluster sub-district, and detailed description has been done to these two message in the front.In the present invention, in these two message, increased by three special identifiers, be respectively: cluster cell identifier TCF, cluster sub-district access barred identifier T_CBA, cluster sub-district access barred permission identifier T_CBQ.By these three identifiers, cluster mobile station can be learnt the cell selecting priority and the sub-district gravity treatment state of adjacent cluster sub-district, and then obtains the required relevant parameter of sub-district gravity treatment.
Equally, if the adjacent cluster sub-district in the BA3 table all forbids inserting, cluster mobile station then can be considered the information that BA1 or BA2 table provides again, obtains the required relevant parameter of sub-district gravity treatment according to these information.
Then, enter step 305: carry out the calculating and the ordering of adjacent area C2 value.
In the present invention, adopt the C2 algorithm equally, when satisfying the sub-district reselection conditions, select the Target cell of the maximum adjacent area of C2 value as the sub-district gravity treatment.
But in the inventive method, different in the calculating of C2 and the prior art, mainly show: in the calculating of C2, increased the preferred amount of bias GT_CRO in cluster sub-district, guarantee to make the cluster sub-district be better than other GSM public network cell by this amount of bias as the gravity treatment Target cell in the place that has the cluster sub-district to cover.
After calculating the C2 value of each neighbor cell, just can sort to different adjacent areas, during the gravity treatment of sub-district, select the maximum sub-district of C2 value according to calculated value.
Therefore, enter step 306, judge whether to satisfy the sub-district reselection criterion.
Such as, determine whether the triggering cell gravity treatment by judging whether following condition satisfies:
(1) the travelling carriage C2 value of calculating certain sub-district (belonging to same lane place with current area) surpasses continuous 5 seconds of the C2 value of travelling carriage current service cell;
(2) the travelling carriage C2 value of calculating certain sub-district (not belonging to same lane place with current area) surpassed the C2 value of travelling carriage current service cell and sub-district gravity treatment lagged value sum continuous 5 seconds;
(3) current service cell is under an embargo;
(4) travelling carriage is monitored out downlink failure;
(5) continuous 5 seconds of the C1 value of Serving cell is less than 0.
When above-mentioned any one condition satisfies, can trigger cluster mobile station and carry out the sub-district gravity treatment.
If satisfy the sub-district reselection criterion, then enter step 307: carry out the sub-district gravity treatment, at this moment, need to select the sub-district of C2 maximum as the gravity treatment Target cell.
After entering this sub-district, return step 301: behind the resident new cluster sub-district of cluster mobile station, reenter idle pulley or when having the group calling notice, enter the group calling receiving mode.
If do not satisfy the sub-district reselection criterion, then return step 302: continue to carry out the measurement of cluster neighboring area signal by receiving the BA3 table.
Realization flow by the invention described above as seen, the present invention is on existing GSM normative foundation, by increasing the BA3 table, make and on the BCCH of cluster sub-district channel, send BA1 table and BA3 table simultaneously, perhaps on the SACCH of cluster sub-district channel, send BA2 table and BA3 table simultaneously, make cluster mobile station when resident cluster overlay network, can preferentially obtain cluster adjacent area reselecting parameters according to the information of BA3, and in existing system message 3 and system message 4, increase the identification information of identifying cells character and state, make cluster mobile station can determine whether to be the cluster sub-district, and then obtain corresponding reselecting parameters for the calculating of reselection algorithm C2 according to these identification informations.Characteristics at the cluster overlay network, in the algorithm of C2, increase the cluster preferred amount of bias GT_CRO in sub-district, further guaranteed in the place that has the cluster sub-district to cover, make the cluster sub-district be better than other GSM public network cell as the gravity treatment Target cell, realized effectively on GSM and cluster overlay network, under the prerequisite that does not promote cluster mobile station bottom performance requirement, cluster mobile station can be resided in the cluster sub-district muchly.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (7)
1, method of cell reselection during a kind of concentrate mobile station residing concentrate laminated network, described cluster overlay network comprises the trunked base station subsystem, it is characterized in that, described method comprises:
A, initialization system message 21 and BA3 tableau format, described BA3 table comprises the cluster neighboring BS information;
B, described trunked base station subsystem send the BA3 table by described system message 21 to described cluster mobile station;
The described BA3 of first search shows and obtains cluster adjacent area cell reselection parameters when C, described concentrate mobile station residing concentrate laminated network;
D, calculate the gravity treatment Target cell according to the described cluster adjacent area cell reselection parameters of obtaining;
E, when satisfying the sub-district reselection conditions, described cluster mobile station is transformed in the described Target cell resident.
2, method according to claim 1 is characterized in that, described step B comprises:
B1, when described cluster mobile station is in idle pulley, described trunked base station subsystem sends BA1 table and BA3 table simultaneously on the Broadcast Control Channel of cluster sub-district, wherein, described BA1 table sends by system message 2, and described BA3 table sends by system message 21;
B2, when described cluster mobile station is in the group calling receiving mode, described trunked base station subsystem sends BA2 table and BA3 table simultaneously on the slow associated control channel of cluster sub-district, wherein, described BA2 table sends by system message 5, and described BA3 table sends by system message 21.
3, method according to claim 1 is characterized in that, described step C comprises:
C1, described cluster mobile station carry out neighboring area signal according to described BA3 table and measure;
C2, obtain system message 3 or system message 4 that described BA3 shows preceding 6 cluster adjacent areas;
C3, obtain cluster adjacent area cell reselection parameters according to described system message 3 or system message 4.
4, method according to claim 3 is characterized in that, described system message 3 and system message 4 comprise respectively: cluster cell ID, cluster sub-district access barred sign, cluster sub-district access barred allow sign.
5, method according to claim 4 is characterized in that, described step C3 comprises:
C31, obtain cell selecting priority and the sub-district gravity treatment state that described BA3 shows preceding 6 cluster adjacent areas according to described system message 3 or system message 4;
C32, cell selecting priority and the sub-district gravity treatment state of showing preceding 6 cluster adjacent areas according to the described BA3 that obtains are determined cluster adjacent area cell reselection parameters.
6, method according to claim 4 is characterized in that, described step D comprises:
D1, calculate the C2 value of described 6 adjacent areas as follows;
When Penalty time ≠ 1111, C2=C1+GT_FLAG * GT_CRO+CRO-TO * H (PT-T);
When Penalty time=11111, C2=C1+GT_FLAG * GT_CRO-CRO;
Wherein, when X＞0, function H (x)=0; When X≤0, function H (x)=1;
C1 is the wireless channel parameter of the current resident cluster sub-district of described cluster mobile station;
CRO is sub-district gravity treatment biasing;
TO is interim biasing;
PT is a Penalty time;
T is a timer, when described cluster mobile station measures this sub-district when being the adjacent sub-district of level value maximum, calculates since 0;
For cluster suitable cell, GT_FLAG=1; For GSM public network cell and non-cluster suitable cell, GT_FLAG=0;
GT_CRO is preferably to setover in the cluster sub-district;
D2, adjacent area that C2 value in described 6 adjacent areas is maximum are as the gravity treatment Target cell.
7, method according to claim 6 is characterized in that, described sub-district reselection conditions comprises:
(1) described cluster mobile station calculates certain sub-district C2 value of belonging to same lane place with described current resident cluster sub-district above continuous 5 seconds of the C2 value of the current resident cluster of described cluster mobile station sub-district;
(2) described cluster mobile station calculates certain sub-district C2 value that described current resident cluster sub-district belongs to same lane place and surpassed the C2 value of the current resident cluster of described cluster mobile station sub-district and sub-district gravity treatment lagged value sum continuous 5 seconds;
(3) current resident cluster sub-district is under an embargo;
(4) described cluster mobile station is monitored out downlink failure;
(5) continuous 5 seconds of the C1 value of described current resident cluster sub-district is less than 0.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009043314A1 (en) * | 2007-09-28 | 2009-04-09 | Huawei Technologies Co., Ltd. | A call controlling method, base station subsystem and user terminal |
| CN101547484B (en) * | 2008-03-26 | 2010-12-29 | 上海摩波彼克半导体有限公司 | Method for realizing cell re-selection by mobile device in mobile communication system |
| CN102484847A (en) * | 2009-08-21 | 2012-05-30 | 株式会社Ntt都科摩 | Mobile communication method, radio access network device, and exchange |
| CN101087145B (en) * | 2007-05-24 | 2012-06-27 | 华为技术有限公司 | Channel search and saving method and device for frequency modulation broadcast |
| CN104581651A (en) * | 2014-03-26 | 2015-04-29 | 海能达通信股份有限公司 | Terminal, trunk system and station positioning method of trunk system |
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| FI105639B (en) * | 1997-06-25 | 2000-09-15 | Nokia Mobile Phones Ltd | An improved method for cell switching |
| FI982000A (en) * | 1998-09-16 | 2000-03-17 | Nokia Mobile Phones Ltd | Improved method and arrangement for cell replacement |
| CN1194570C (en) * | 2001-08-27 | 2005-03-23 | 华为技术有限公司 | Method for making base station have base station controller function in mobile communication system |
| EP1324625A1 (en) * | 2001-12-17 | 2003-07-02 | Alcatel | Method and system for arranging a cell-reselection process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101087145B (en) * | 2007-05-24 | 2012-06-27 | 华为技术有限公司 | Channel search and saving method and device for frequency modulation broadcast |
| WO2009043314A1 (en) * | 2007-09-28 | 2009-04-09 | Huawei Technologies Co., Ltd. | A call controlling method, base station subsystem and user terminal |
| CN101547484B (en) * | 2008-03-26 | 2010-12-29 | 上海摩波彼克半导体有限公司 | Method for realizing cell re-selection by mobile device in mobile communication system |
| CN102484847A (en) * | 2009-08-21 | 2012-05-30 | 株式会社Ntt都科摩 | Mobile communication method, radio access network device, and exchange |
| CN104581651A (en) * | 2014-03-26 | 2015-04-29 | 海能达通信股份有限公司 | Terminal, trunk system and station positioning method of trunk system |
| CN104581651B (en) * | 2014-03-26 | 2019-03-05 | 海能达通信股份有限公司 | Terminal, group system and its method for positioning website |
| WO2016054776A1 (en) * | 2014-10-08 | 2016-04-14 | Motorola Solutions, Inc. | Methods and systems for implementing a self-managed control channel |
| US9913110B2 (en) | 2014-10-08 | 2018-03-06 | Motorola Solutions, Inc. | Methods and systems for implementing a self-managed control channel |
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| CN100337509C (en) | 2007-09-12 |
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