CN1194489C - Method for selecting main cell of user apparatus in mobile communication system - Google Patents
Method for selecting main cell of user apparatus in mobile communication system Download PDFInfo
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- CN1194489C CN1194489C CNB021165998A CN02116599A CN1194489C CN 1194489 C CN1194489 C CN 1194489C CN B021165998 A CNB021165998 A CN B021165998A CN 02116599 A CN02116599 A CN 02116599A CN 1194489 C CN1194489 C CN 1194489C
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Abstract
The present invention provides a method for selecting a main cell of user equipment in a mobile communication system, which comprises the following steps: firstly, user equipment periodically measures the signal-to-jamming ratio value of pilot information which activates and gathers all special physical control channels for cells, and the signal-to-jamming ratio value can reflect the watt level, the channel jamming degree and the noise level of the signal transmitted by the special channels. Then, according to a setting condition, the cell in which the special channel with the optimal signal-to-jamming ratio is positioned is determined, and the cell is set as a main cell of the user equipment. In the present invention, the UE can activate, gather and select the cell of which the communication effect is optimal as own main cell. Thereby, the present invention ensures the communication quality in the communication system, overcomes a plurality of problems existing in the prior art which adopts the method of RSCP measuring to select the main cells. Furthermore, the present invention can select the cell according to the signal-to-jamming ratio value which is calculated by the UE, so the present invention can be implemented under the condition that the spending of the system is not increased.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the method for subscriber equipment selection main plot in a kind of mobile communication system.
Background technology
At present, at WCDMA (Wideband CDMA: wideband CDMA) in the mobile communication system, (Site Selection Transmit Diversity: base station selected transmit diversity) method selects a sub-district to be set to UE (User Equipment: main plot subscriber equipment) from Active Set to have adopted SSDT, and other sub-district is non-main plot in the Active Set, the transmitting business data are responsible in the main plot, but not main plot transmitting business data not then, because the emission of many sub-districts brings the interference to other users, the existence of non-main plot has simultaneously guaranteed that UE can be in the selection that does not have to carry out fast under the network participation base station to reduce; Wherein Active Set is the set of a plurality of sub-districts of keeping in touch with UE simultaneously, and this moment, UE can receive P-CPICH (the Priamary Common Pilot Channel: information Primary Common Pilot Channel) of each sub-district in the Active Set simultaneously.
And, to select the main plot be RSCP (Received Signal Code Power: received signal code power) realize, and determine to have the main plot of the sub-district of the highest RSCP for this UE according to measurement result by measuring P-CPICH periodically to UE in the prior art.
By above-mentioned prior art as can be seen: though P-CPICH is the continuous pilot channel, can reflect the channel conditions in one period continuous time, P-CPICH is the common signal channel that reference is provided for other channel after all, can not reflect the situation of dedicated channel definitely.And the watt level that the measured RSCP of UE can only reflected signal can't reflect the interference and the noise size of channel, and promptly RSCP does not provide the measurement parameter based on the size of the annoyance level of channel and noise, therefore can't embody channel situation all sidedly.For example when UE carries out the main plot selection, selected the main plot of the sub-district of a RSCP maximum as oneself in its Active Set, but the present user in this sub-district is more, interference and noise are also bigger, as the main plot, is not best choice with this sub-district concerning this UE.In addition, CDMA (code division multiple access) mobile communication system is interference-limited system, and the size of interference has determined the sub-district that the quality of the number of users and the service that provides is provided.Therefore, do not consider that the interference of channel and the selection that noise condition is carried out the UE main plot can't guarantee that UE selects the main plot of the sub-district of a communication conditions the best as oneself.
Summary of the invention
The invention provides the method for subscriber equipment selection main plot in a kind of mobile communication system, to guarantee that UE can select the main plot of the sub-district of a communication conditions the best as oneself in the mobile communication system.
The object of the present invention is achieved like this: subscriber equipment selects the method for main plot to comprise in the mobile communication system:
(1) to the pilot frequency information of each cell-specific physical control channel in the Active Set, the signal interference ratio value of each time slot in each physical frame of subscriber equipment computation of Period, and the signal interference ratio value of 14 time slots in this physical frame added up the summation back as the signal interference ratio value of this sub-district, watt level, the annoyance level of channel and the size of noise of signal interference ratio reflection dedicated channel institute transmission signals;
(2) determine the sub-district at the Dedicated Physical Control Channel place of signal interference ratio the best, promptly determine the sub-district at the dedicated channel place of communication efficiency the best;
(3) this sub-district is set to the main plot of subscriber equipment, and other sub-districts then are set to the non-main plot of subscriber equipment.
Described Dedicated Physical Control Channel is the Dedicated Physical Control Channel in WCDMA (Wideband Code Division Multiple Access (WCDMA)) mobile communication system.
Described step (3) comprising:
(31) set threshold value according to the communication needs of subscriber equipment based on the signal interference ratio value;
(32) signal interference ratio value and this threshold value with each Dedicated Physical Control Channel compares;
(33) sub-district that meets the Dedicated Physical Control Channel place that this threshold value requires is the sub-district of signal interference ratio value the best.
By technical scheme that the invention described above provided as can be seen, the present invention carries out the selection of UE main plot by the signal interference ratio of measuring the dedicated channel pilot frequency information, the signal interference ratio concentrated expression of pilot frequency information the watt level of signal, the annoyance level of channel and the size of noise, so the pilot frequency information of dedicated channel can reflect the situation of UE applied dedicated channel in the practical communication process exactly, thereby, UE can select the main plot of the sub-district of a communication efficiency the best as oneself among the present invention in Active Set, and then guaranteed the communication quality in the communication system, overcome the existing problems of method of available technology adopting measure R SCP selection main plot.In addition, in the WCDMA system, UE will carry out the calculating of signal interference ratio value at each time slot, with the regulation and control base station down transmitting power, the present invention just can carry out cell selecting according to the signal interference ratio value that UE has calculated, and so just can implement the present invention under the situation of the expense that does not increase system.
Description of drawings
Fig. 1 is a specific embodiments flow chart of the present invention.
Embodiment
The method of available technology adopting SSDT is by selecting the sub-district of transmit signal power maximum as main plot transmitting business data in the Active Set, limit other sub-district transmitting business data messages in the Active Set simultaneously, thereby reduce interference other users in the sub-district.But if UE selects the sub-district only to consider the signal power size, and do not consider the interference and the noise of channel, just might select all big sub-district of signal power, interference and noise, be helpless to reduce down transmitting power as the main plot.The present invention selects the method for main plot to improve at this problem to UE just.
Subscriber equipment selects the method for main plot to be particularly useful in the WCDMA mobile communication system in the mobile communication system provided by the present invention, and embodiment is described below in conjunction with the accompanying drawings:
Each sub-district DPCCH in the step 1:UE period measurement Active Set (Dedicated PhysicalControl Channel: the SIR of pilot tone Dedicated Physical Control Channel) (Signal-to-InterferenceRatio: value signal interference ratio), signal interference ratio has reflected watt level, the annoyance level of channel and the size of noise of Dedicated Physical Control Channel institute transmission signals;
Calculate the sir value of each time slot in each physical frame, and with the summation that adds up of the sir value of 14 time slots in this physical frame; SIR has utilized the pilot frequency information of Dedicated Physical Control Channel, the situation that can reflect dedicated channel, and in the technical standard of present WCDMA, the dedicated channel of main plot and non-main plot is all launched DPCCH information in the SSDT process, for enforcement of the present invention provides the foundation;
In addition, because in the WCDMA system, each time slot of UE all will calculate sir value carrying out the control of down transmitting power, so the present invention can not increase the expense of system, and existing system is not exerted an influence yet;
Step 2: threshold value based on sir value is set according to the communication needs of subscriber equipment;
Step 3: pilot frequency information sir value and this threshold value of each Dedicated Physical Control Channel in the step 1 are compared, and judge the whether coincidence gate limit value requirement of each sir value, if meet, execution in step 4, otherwise, execution in step 5;
Step 4: the sub-district that meets the Dedicated Physical Control Channel place of this threshold value requirement is the sub-district of signal interference ratio value the best, and this sub-district is set to the main plot of subscriber equipment;
Step 5: this sub-district is set to the non-main plot of subscriber equipment.
By said process, UE just can select the main plot of the sub-district of a communication efficiency the best as oneself in Active Set, and non-main plot is done in other sub-district.
Also can be in the specific embodiment of the invention by directly comparing the signal interference ratio value of each sub-district in the Active Set, select the sub-district of the sub-district of signal interference ratio value maximum as communication efficiency the best, it is set to the main plot of subscriber equipment, other sub-district then is set to the non-main plot of subscriber equipment.
Claims (3)
1, the method for subscriber equipment selection main plot in a kind of mobile communication system comprises:
(1) to the pilot frequency information of each cell-specific physical control channel in the Active Set, the signal interference ratio value of each time slot in each physical frame of subscriber equipment computation of Period, and the signal interference ratio value of 14 time slots in this physical frame added up the summation back as the signal interference ratio value of this sub-district, watt level, the annoyance level of channel and the size of noise of signal interference ratio reflection dedicated channel institute transmission signals;
(2) determine the sub-district at the Dedicated Physical Control Channel place of signal interference ratio the best, promptly determine the sub-district at the dedicated channel place of communication efficiency the best;
(3) this sub-district is set to the main plot of subscriber equipment, and other sub-districts then are set to the non-main plot of subscriber equipment.
2, the method for subscriber equipment selection main plot in the mobile communication system according to claim 1 is characterized in that described Dedicated Physical Control Channel is the Dedicated Physical Control Channel in the WCDMA mobile communication system.
3, the method for subscriber equipment selection main plot in the mobile communication system according to claim 1 and 2 is characterized in that described step (3) comprising:
(31) set threshold value according to the communication needs of subscriber equipment based on the signal interference ratio value;
(32) signal interference ratio value and this threshold value with each Dedicated Physical Control Channel compares;
(33) sub-district that meets the Dedicated Physical Control Channel place that this threshold value requires is the sub-district of signal interference ratio value the best.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165998A CN1194489C (en) | 2002-04-12 | 2002-04-12 | Method for selecting main cell of user apparatus in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165998A CN1194489C (en) | 2002-04-12 | 2002-04-12 | Method for selecting main cell of user apparatus in mobile communication system |
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| Publication Number | Publication Date |
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| CN1452334A CN1452334A (en) | 2003-10-29 |
| CN1194489C true CN1194489C (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021165998A Expired - Fee Related CN1194489C (en) | 2002-04-12 | 2002-04-12 | Method for selecting main cell of user apparatus in mobile communication system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2202896B1 (en) * | 2004-03-30 | 2011-12-21 | Sony Corporation | Mobile communications terminal and radio communications system |
| CN101541060B (en) * | 2008-03-20 | 2011-03-09 | 数码通电讯有限公司 | Main area mechanism |
| CN101998623B (en) * | 2009-08-11 | 2012-04-25 | 电信科学技术研究院 | Method and system for determining positions of terminals |
| CN102348229B (en) * | 2009-08-11 | 2014-09-24 | 电信科学技术研究院 | Terminal position determining method and system |
| CN102378308A (en) * | 2010-08-06 | 2012-03-14 | 中兴通讯股份有限公司 | Coordinated multi-point transmission (CoMP) system and method for selecting primary cell |
| CN107231681A (en) * | 2016-03-23 | 2017-10-03 | 中兴通讯股份有限公司 | Ascending power control method, device and the radio network controller of heterogeneous network |
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