CN101730165A - Switching method of N-frequency point co-frequency network - Google Patents
Switching method of N-frequency point co-frequency network Download PDFInfo
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- CN101730165A CN101730165A CN200810224429A CN200810224429A CN101730165A CN 101730165 A CN101730165 A CN 101730165A CN 200810224429 A CN200810224429 A CN 200810224429A CN 200810224429 A CN200810224429 A CN 200810224429A CN 101730165 A CN101730165 A CN 101730165A
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Abstract
The invention discloses a switching method of an N-frequency point co-frequency network, which comprises: dividing N carriers of an N-frequency point cell into two classes, namely full coverage carriers covering the whole cell and central coverage carriers covering only the central area of the cell in advance, wherein the full coverage carriers of neighboring cells are different and the full coverage carriers comprise the main carriers of the N-frequency point cells; switching users in the coverage of the central coverage carriers to the coverage of the full coverage carriers when the interference of the users with the neighboring cells exceeding a threshold; and switching users in the coverage of the full coverage carriers to the coverage of the central coverage carriers when the users are positioned in the central area of the cells. The method of the invention can reduce co-frequency interference of neighboring cells.
Description
Technical field
The present invention relates to method for network access, the changing method in particularly a kind of N frequency point co-frequency network.
Background technology
At present, the networking mode of TD-SCDMA LCR system main flow is the networking of N frequency point co-frequency, and promptly an identical N frequency is all used in each sub-district, and selects a frequency as main carrier from N frequency, all the other frequencies are as auxilliary carrier wave, and the main carrier of neighbor cell is different.In same sub-district, only on main carrier, send downlink synchronous signal (DwPTS) and broadcast message and relevant common signal channel.
With respect to single-frequency point scheme, N frequency scheme is disturbed the presence of intercell interference of common signal channel between co-channel interference becomes frequently, improved the robustness of common signal channel greatly.But N frequency scheme is not considered the Traffic Channel interference and how to be reduced.As shown in Figure 1, though sub-district 1 is different with sub-district 2 main carriers, the auxilliary carrier wave of sub-district 1 may be identical with the main carrier or the auxilliary carrier wave of sub-district 2, at this moment, for the user of cell boarder, then problem of co-channel interference can occur.Simultaneously because the open loop power control algorithm usually with Initial Trans than higher, will cause serious co-channel interference at cell boarder with more high-power emission.
Serious co-channel interference is difficult to avoid in the N frequency point co-frequency network, and is the principal risk of N frequency point co-frequency networking, no matter operator still all is difficult to accept concerning the user, therefore needs further to reduce even isolate co-channel interference.
Summary of the invention
In view of this, the invention provides the changing method in a kind of N frequency point co-frequency network, can reduce the co-channel interference of neighbor cell in the N frequency point cell.
For achieving the above object, the present invention adopts following technical scheme:
Cut-in method in a kind of N frequency point co-frequency network comprises:
N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell;
Cover user on the carrier wave for the center, when this user surpasses default thresholding to the interference of adjacent area, this user is switched on all standing carrier wave;
For the user on all standing carrier wave, when definite this user is positioned at the center of housing estate area, this user is switched to the center cover on the carrier wave.
Preferably, the user on the judgement center covering carrier wave disturbs the mode that surpasses default thresholding to be to the adjacent area:
User on center covering carrier wave when the ISCP of descending time slot is higher than default ISCP thresholding, determines that this user disturbs above default thresholding the adjacent area; And/or,
User on center covering carrier wave when descending code channel transmitting power is higher than the first default descending power thresholding, determines that this user disturbs above default thresholding the adjacent area; And/or,
User on center covering carrier wave when uplink transmission power is higher than default ascending power thresholding, determines that this user disturbs above thresholding the adjacent area.
Preferably, this method further comprises: the user on the center covering carrier wave when this user's QoS can't guarantee, switches to this user on all standing carrier wave.
Preferably, judge that the mode that user's QoS can't guarantee is:
When the user throughput on the center covering carrier wave is lower than default throughput threshold, determine that user's QoS can't guarantee; And/or,
When the user DCH error rate BLER on the center covering carrier wave is higher than the first default error rate thresholding, determine that user's QoS can't guarantee.
Preferably, determine that the mode that user on all standing carrier wave is positioned at the center of housing estate area is:
User on all standing carrier wave during greater than default isolation thresholding, determines that this user is positioned at the center of housing estate area in the difference of this sub-district PCCPCH RSCP and adjacent area PCCPCH RSCP; Perhaps,
As the user DCH BLER on all standing carrier wave during, determine that this user is positioned at the center of housing estate area less than default second error rate thresholding; Perhaps,
When the descending code channel transmitting power of the user on all standing carrier wave during, determine that this user is positioned at the center of housing estate area less than the default second descending power thresholding.
Preferably, this method further comprises: when the user throughput on all standing carrier wave is higher than default throughput threshold, this user is switched to the center cover on the carrier wave.
Preferably, this method further comprises: insert the main carrier in the N frequency point cell during user's initial access network, and when user throughput is higher than default throughput threshold on main carrier, perhaps, when user's QoS can't guarantee, should insert the user and switch to other all standing carrier waves or center covering carrier wave.
Preferably, this method further comprises: during user's initial access network, if user's PCCPCH RSCP greater than default pilot frequency intensity thresholding, then covers carrier wave with this user's access center, otherwise, this user is inserted all standing carrier wave.
Preferably, this method further comprises: the user is being carried out the minizone when switching, preferentially selecting carrier wave with source carrier wave different frequent points as target carrier in Target cell.
As seen from the above technical solution, among the present invention, N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell; Cover user on the carrier wave for the center, when this user surpasses default thresholding to the interference of adjacent area, this user is switched on all standing carrier wave; For the user on all standing carrier wave, when definite this user is positioned at the center of housing estate area, this user is switched to the center cover on the carrier wave.By the way, when user's co-channel interference is impatient at, be transformed into alien frequencies, be equivalent between homogeneous-frequency adjacent-domain, provide the isolation strip of a variable-width, reduced co-channel interference.
Description of drawings
Fig. 1 is the strong jamming schematic diagram of minizone.
Fig. 2 is the flow chart of changing method in the N frequency point co-frequency network among the present invention.
Fig. 3 is the carrier wave coverage exemplary plot of 3 frequency point cells among the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Basic thought of the present invention is: be transformed into alien frequencies when user's co-channel interference is impatient at, has been equivalent to provide the isolation strip of a variable-width between homogeneous-frequency adjacent-domain.
Fig. 2 is the flow chart of changing method in the N frequency point co-frequency network among the present invention.As shown in Figure 2, this method comprises:
In changing method of the present invention, keep N frequency point cell fundamental characteristics, be about to common signal channel and only be configured on the main carrier of N frequency.During the network planning, in arbitrary cells, the selection portion sub-carrier covers whole sub-district from the N frequency, and these carrier waves are called all standing carrier wave; The covering radius of all the other carrier waves in the sub-district is shunk, coverage cell center only, i.e. this type of carrier wave discontinuous covering in network is called the center and covers carrier wave.
Particularly, for guaranteeing in the N frequency point co-frequency network that for all users provide normal down-going synchronous, broadcasting and public service, all standing carrier wave comprises the main carrier of this sub-district.Simultaneously, according to the network planning needs of reality, all standing carrier wave also can comprise one or more auxilliary carrier waves.
Carrying out the branch time-like of N carrier wave, can divide arbitrarily according to actual needs.The covering radius that the center covers on the carrier wave is a real-time change, and this is specifically by dynamically determining the switch decision of user on the carrier wave.Because the switching of user between different carrier, the center that makes cover the covering radius of each time slot on the carrier wave can be inequality, the covering radius of not concentricity covering intercarrier also can be different.
In changing method of the present invention, the center of neighbor cell covers carrier wave may be identical, is condition with the user to the interference of adjacent area therefore, when interference acquires a certain degree, the user switched on all standing carrier wave, thereby reduce co-channel interference.
Particularly, cover user on the carrier wave for the center, judge its interference to the adjacent area whether surpass default thresholding mode can for:
1, the user on center covering carrier wave when the ISCP of descending time slot is higher than default ISCP thresholding, determines that this user disturbs above default thresholding the adjacent area;
2, the user on center covering carrier wave when descending code channel transmitting power is higher than the first default descending power thresholding, determines that this user disturbs above default thresholding the adjacent area;
3, the user on center covering carrier wave when uplink transmission power is higher than default ascending power thresholding, determines that this user disturbs above thresholding the adjacent area.
The base station can judge whether the user surpasses default thresholding to the interference of adjacent area according to the combination of above-mentioned one or more conditions.When determine surpassing default thresholding, then the user is switched on all standing carrier wave, the target carrier that specifically switches to can be determined according to existing access control modes such as load balancing.
For the user on all standing carrier wave, be the proof load equilibrium, when the user is positioned at the center of housing estate area, this user is switched to the center cover on the carrier wave, thus the load that alleviates all standing carrier wave.
Particularly, judge the user whether be positioned at the center of housing estate area mode can for:
1, the user on all standing carrier wave when satisfying the requiring of isolation, can determine that this user is positioned at the center of housing estate area; Isolation is defined as the poor of this sub-district PCCPCH RSCP and adjacent area PCCPCH RSCP, and as user during at two cell edges, isolation approaches 0, when the user to the base station near the time, isolation increases gradually.When isolation greater than certain thresholding, just trigger the user and switch to the center and cover carrier wave;
2, as the user DCH BLER on all standing carrier wave during, can determine that this user is positioned at the center of housing estate area less than default second error rate thresholding;
3, when the descending code channel transmitting power of the user on all standing carrier wave during, can determine that this user is positioned at the center of housing estate area less than the default second descending power thresholding.
After definite user is positioned at the center of housing estate area, it is switched to the center cover on the carrier wave.The target carrier that specifically switches to can be determined according to existing access control modes such as load balancing.
Because covering the switching of intercarrier, all standing carrier wave that above-mentioned condition causes and center may carry out at any time, therefore the coverage of center covering carrier wave also may change at any time, thereby the coverage that makes a plurality of different centers cover carrier wave can be inequality, same center covers carrier wave, also may be different at the covering radius of different time-gap.For example, Figure 3 shows that certain time slot x of 3 frequency point cells, main carrier Freq1 covers whole cell range, and auxilliary carrier wave Freq2 is different with the Freq3 coverage, carves the covering radius of the covering radius of Freq2 less than Freq3 at this moment.
The measurement of above-mentioned every index (as ISCP, the DCH BLER of user throughput, descending time slot, up-downgoing transmitting power etc.) can be to be undertaken by default Event triggered, also can be to carry out in the cycle, the perhaps combination of dual mode.Simultaneously, above-mentioned all kinds of thresholdings will be provided with according to actual needs, and consider to avoid the table tennis between the intercarrier of sub-district to switch as far as possible.
So far, basic changing method flow process finishes among the present invention.By the way, can when the co-channel interference of community user is impatient at, switch to alien frequencies, be equivalent between homogeneous-frequency adjacent-domain, provide the isolation strip of a variable bandwidth, reduce co-channel interference.
In addition, for further improving user's receptivity, preferably, the user on the center covering carrier wave when QoS can't guarantee, switches to this user on all standing carrier wave; For the user on all standing carrier wave, when user throughput is higher than default throughput threshold, this user is switched to the center cover on the carrier wave.
The mode that the concrete QoS of determining can't guarantee can for: when the center covers user throughput on the carrier wave and is lower than default throughput threshold, determine that user's QoS can't guarantee; And/or, when the user DCH error rate BLER on the center covering carrier wave is higher than the first default error rate thresholding, determine that user's QoS can't guarantee.At this moment, the user is switched on all standing carrier wave, to guarantee user's QoS.
Simultaneously, the user among the present invention can have two kinds of schemes when initially inserting:
1, insert the user and at first insert main carrier, determine whether and will move to other all standing carrier waves or center covering carrier wave to the user according to judgment condition then.Particularly, when user throughput on the main carrier is higher than default throughput threshold, perhaps when user's QoS can't guarantee, should inserts the user and switch on other all standing carrier waves or the center covering carrier wave.Wherein, determine that the mode that user's QoS can't guarantee can be identical with aforesaid mode, just repeat no more here.
2, compare according to the measured value of user's PCCPCH RSCP and default pilot frequency intensity thresholding, at the measured value of PCCPCH RSCP during greater than the pilot frequency intensity thresholding, the signal receiving quality that shows the user is better, nearer apart from the base station, then this user's access center is covered carrier wave, otherwise this user is inserted all standing carrier wave.In addition, carrying out the minizone when switching, preferentially carry out alien frequencies and switch, promptly network side should select carrier wave with the source frequency different frequent points as target carrier in Target cell as far as possible.
Can reduce during the carriers carry plan of operation at the planning of disturbing, can cover full sub-district, and need not too much to consider the interference of adjacent area with frequency such as the HSDPA business.Use cut-in method of the present invention, under the framework of N frequency and limited carrier resource condition, reduce co-channel interference in the access procedure to greatest extent.Particularly, the user is satisfying when pre-conditioned, covers intercarrier at all standing carrier wave and center and switches, thereby make and automatically switch to alien frequencies when co-channel interference is impatient at, and realizes the variable broadband isolation strip between co-frequency neighbor cell.The center covers the carrier wave radius shrink after, can reduce interference, and the switching overwhelming majority of minizone all is that alien frequencies switches to homogeneous-frequency adjacent-domain, improved handover success rate; Simultaneously, the center covers each time slot of carrier wave and dynamically adjusts coverage, and the switching times between the intercarrier of sub-district is reduced as far as possible, can save the switching arranged resources on the carrier wave, thereby improve power system capacity, reduces the difficulty of the TD-SCDMA network planning and optimization.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the cut-in method in the N frequency point co-frequency network is characterized in that this method comprises:
N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell;
Cover user on the carrier wave for the center, when this user surpasses default thresholding to the interference of adjacent area, this user is switched on all standing carrier wave;
For the user on all standing carrier wave, when definite this user is positioned at the center of housing estate area, this user is switched to the center cover on the carrier wave.
2. method according to claim 1 is characterized in that, the user that the judgement center covers on the carrier wave disturbs the mode that surpasses default thresholding to be to the adjacent area:
User on center covering carrier wave when the ISCP of descending time slot is higher than default ISCP thresholding, determines that this user disturbs above default thresholding the adjacent area; And/or,
User on center covering carrier wave when descending code channel transmitting power is higher than the first default descending power thresholding, determines that this user disturbs above default thresholding the adjacent area; And/or,
User on center covering carrier wave when uplink transmission power is higher than default ascending power thresholding, determines that this user disturbs above thresholding the adjacent area.
3. method according to claim 1 is characterized in that, this method further comprises: the user on the center covering carrier wave when this user's QoS can't guarantee, switches to this user on all standing carrier wave.
4. method according to claim 3 is characterized in that, the mode that judgement user's QoS can't guarantee is:
When the user throughput on the center covering carrier wave is lower than default throughput threshold, determine that user's QoS can't guarantee; And/or,
When the user DCH error rate BLER on the center covering carrier wave is higher than the first default error rate thresholding, determine that user's QoS can't guarantee.
5. method according to claim 1 is characterized in that, determines that the mode that user on all standing carrier wave is positioned at the center of housing estate area is:
User on all standing carrier wave during greater than default isolation thresholding, determines that this user is positioned at the center of housing estate area in the difference of this sub-district PCCPCH RSCP and adjacent area PCCPCH RSCP; Perhaps,
As the user DCH BLER on all standing carrier wave during, determine that this user is positioned at the center of housing estate area less than default second error rate thresholding; Perhaps,
When the descending code channel transmitting power of the user on all standing carrier wave during, determine that this user is positioned at the center of housing estate area less than the default second descending power thresholding.
6. method according to claim 1 is characterized in that, this method further comprises: when the user throughput on all standing carrier wave is higher than default throughput threshold, this user is switched to the center cover on the carrier wave.
7. method according to claim 1, it is characterized in that, this method further comprises: insert the main carrier in the N frequency point cell during user's initial access network, and when user throughput is higher than default throughput threshold on main carrier, perhaps, when user's QoS can't guarantee, should insert the user and switch to other all standing carrier waves or center covering carrier wave.
8. method according to claim 1 is characterized in that, this method further comprises: during user's initial access network, if user's PCCPCH RSCP is greater than default pilot frequency intensity thresholding, then this user's access center is covered carrier wave, otherwise, this user is inserted all standing carrier wave.
9. method according to claim 1 is characterized in that, this method further comprises: the user is being carried out the minizone when switching, preferentially selecting carrier wave with source carrier wave different frequent points as target carrier in Target cell.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223679A (en) * | 2011-07-12 | 2011-10-19 | 电信科学技术研究院 | Method and equipment for processing load congestion |
| CN103535087A (en) * | 2013-04-01 | 2014-01-22 | 华为技术有限公司 | Reuse method and equipment of broadcast control channel BCCH carrier wave frequency point |
| CN110267315A (en) * | 2019-06-28 | 2019-09-20 | 南昌黑鲨科技有限公司 | Network connection control method, system, intelligent terminal and computer readable storage medium |
| CN110768765A (en) * | 2018-07-27 | 2020-02-07 | ***通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
| CN110868753A (en) * | 2018-08-27 | 2020-03-06 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
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2008
- 2008-10-14 CN CN200810224429A patent/CN101730165A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223679A (en) * | 2011-07-12 | 2011-10-19 | 电信科学技术研究院 | Method and equipment for processing load congestion |
| CN103535087A (en) * | 2013-04-01 | 2014-01-22 | 华为技术有限公司 | Reuse method and equipment of broadcast control channel BCCH carrier wave frequency point |
| CN103535087B (en) * | 2013-04-01 | 2017-04-12 | 华为技术有限公司 | Reuse method and equipment of broadcast control channel BCCH carrier wave frequency point |
| CN110768765A (en) * | 2018-07-27 | 2020-02-07 | ***通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
| CN110768765B (en) * | 2018-07-27 | 2022-04-15 | ***通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
| CN110868753A (en) * | 2018-08-27 | 2020-03-06 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
| CN110868753B (en) * | 2018-08-27 | 2022-08-12 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
| CN110267315A (en) * | 2019-06-28 | 2019-09-20 | 南昌黑鲨科技有限公司 | Network connection control method, system, intelligent terminal and computer readable storage medium |
| CN110267315B (en) * | 2019-06-28 | 2021-03-09 | 南昌黑鲨科技有限公司 | Network connection control method, system, intelligent terminal and computer readable storage medium |
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Open date: 20100609 |