CN101267648A - A method for setting TD-SCDMA asymmetric time slot percent - Google Patents
A method for setting TD-SCDMA asymmetric time slot percent Download PDFInfo
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Abstract
The invention improves the flexibility of dissymmetrical time slot proportion configuration of a TD-SCDMA system in a certain extent by setting an uplink and downlink time slot proportion of an indoor independent base station (micro-base station or macro-base station) or a distribution base station (such as a radio frequency remote unit RRU) less than that of an outdoor base station proportion, based on the characteristic that data service request in an indoor environment is large and interference between the indoor base station and the outdoor base station is small, further, the invention lays the foundation of indoor distribution system design of the TD-SCDMA system and late-term performance optimization.
Description
Technical field
The present invention relates to the planning technology of indoor distributed system in TD-SCDMA (TD SDMA access) system, particularly by be provided with indoor stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU: asymmetric time slot ratio Remote Radio Unit), improve the collocation method of indoor data service ability.
Background technology
Along with the increase at full speed and the skyscraper of mobile communication subscriber in the city are more and more, traffic density and covering require also constantly to rise.Many architectural scale are big, quality good, and mobile telephone signal is had very strong shielding action, rely on outdoor covering can not solve indoor hot zones fully merely and cover and the telephone traffic problem.In order to guarantee that indoor distributed system arises at the historic moment for the user provides high-quality communication service.In 3G (Third Generation) Moblie (3G), surpass 60% multi-medium data business in indoor generation with having, thereby according to the characteristics of 3G different systems system, build indoor distributed system at interior of building, the ability that improves indoor covering performance and professional ability, particularly data service is particularly important.
For data service, its characteristic feature is the asymmetry of the traffic loads in up link and the down link, and the size of load depends on different types of service.The TD-SCDMA system adopts TDD (time division duplex) dual-mode, and the transmission of up-downgoing data is controlled by the time slot allocation of control uplink and downlink, and can control, change the time slot ratio that sends and receive.Thereby, when descending timeslot number is counted more than ascending time slot, just can realize that high efficiency transmits the purpose of non-symmetrical service.
Though TD-SCDMA has the ability of configurable uplink and downlink timeslot ratio, when neighbor cell adopts the different time-gap configuration, owing to have certain interference between uplink and downlink timeslot, thereby use scene to propose strict requirement to it.
Comprise 6 business time-slots in the frame structure of TD-SCDMA system, the setting of uplink and downlink timeslot is by time slot switching point time slot, and Fig. 1 is respectively the configuration mode of 3: 3 and 2: 4 for uplink and downlink timeslot ratio.In the networking of outdoor environment, when neighbor cell adopted identical networking, as shown in Figure 2, time slot configuration was 2: 4 cell base station BS
1Cell base station BS to configuration in 3: 3
2Produce comparatively serious disturbance.When neighbor cell adopts inter-frequency networking, though disturb corresponding minimizing, but when different operators network or the network optimization of single carrier network later stage were carried out the layering networking and built, because antenna for base station is stood altogether or station spacing when nearer, the existing equipment index still can't satisfy the requirement of coexistence.Therefore, asymmetric time slot capacity or all base stations of the whole network of sacrificing juncture area adopt unified uplink and downlink timeslot to be configured as existing recommendation solution.
The solution of present outdoor recommendation, be equally applicable to indoor, if but, can have certain drawback in indoor use.At first, the scene that the TD-SCDMA system exists a plurality of sub-districts to cover at indoor same floor exists hardly, thereby the asymmetric time slot capacity of the sacrifice juncture area that is far from being; Secondly, if the indoor and outdoor unification was carried out 2: 4 or asymmetric time slot setting in 1: 5, along with the downlink business time slot ratio enlarges, be more suitable for the data service asymmetric with up-downgoing, but when data service capacity increases, but reduced speech business capacity (speech business is a up-downgoing symmetric form business), thereby the indoor or outdoors zone that speech business is bigger for some data service is less, can there be the problem of off-capacity again, thereby have influenced the flexibility that the asymmetric time slot of TD-SCDMA is provided with greatly.Therefore, if, directly be generalized in the indoor distributed system, can't take into account indoor and outdoors business features and demand simply with the asymmetric time slot capacity of existing sacrifice juncture area or the outdoor solution of the unified uplink and downlink timeslot configuration of the whole network use.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of TD-SCDMA system at indoor employing stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU) during as the signal source mode, at outdoor environment uplink and downlink timeslot configuration mode, the method for the indoor asymmetric time slot ratio of corresponding configuration.
The collocation method of the asymmetric time slot ratio of TD-SCDMA among the present invention is mainly reflected in the different of previous methods: 3G business and indoor and outdoor signal disturb on the basis of basic characteristics in considering indoor environment, utilize the design feature of indoor distributed system self, according to the asymmetric time slot ratio of outdoor environment setting, thereby asymmetric time slot ratio makes the use of asymmetric time slot ratio in the TD-SCDMA system more comprehensive in the disposed chamber.Time slot configuration mode among the present invention does not relate to the concrete operation method of devices from different manufacturers time slot configuration, and it is known to those skilled in the art, and only the ratio to concrete time slot configuration describes.
According to the invention provides a kind of under indoor environment the asymmetric time slot ratio method to set up of TD-SCDMA, may further comprise the steps: big and indoor and outdoor inter base station interference features of smaller according to data traffic requirement in the indoor environment, the uplink and downlink timeslot ratio of indoor stand-alone base station or distributed base station (as radio frequency remote unit RRU) is set to less than the outdoor base station ratio, wherein:
(1) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), be set under the situation of identical single-frequency point or the work of N frequency group, when indoor data traffic requirement is higher, because data service is most for the asymmetric business of up-downgoing, can be set to 2: 4 or 1: 5 by asymmetric time slot ratio;
(2) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of identical single-frequency point or N frequency group, further improve indoor data service ability if desired, can be set to 1: 5 by asymmetric time slot ratio;
(3) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of different single-frequency points or N frequency group, when indoor data traffic requirement is higher, because data service is most for the asymmetric business of up-downgoing, can be set to 2: 4 or 1: 5 by asymmetric time slot ratio;
(4) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of different single-frequency points or N frequency group, further improve indoor data service ability if desired, can be set to 1: 5 by asymmetric time slot ratio.
The present invention is big and indoor and outdoor inter base station interference features of smaller according to data traffic requirement in the indoor environment, the uplink and downlink timeslot ratio of indoor base station can adopt the method that is provided with less than the outdoor base station ratio, thereby having improved the asymmetric time slot ratio configuration flexibility of TD-SCDMA system to a certain extent, also is that the design of indoor distributed system in the TD-SCDMA network and the performance optimization in later stage are laid a good foundation.
Description of drawings
Fig. 1 represents the schematic diagram of different uplink and downlink timeslot ratio configurations in the TD-SCDMA system.
Fig. 2 represents that the asymmetric time slot ratio of TD-SCDMA network is provided with schematic diagram with under frequency and the inter-frequency networking situation.
Fig. 3 represents indoor and outdoor different time-gap percentage of T D-SCDMA network interferences schematic diagram.
Embodiment
Introduce the specific embodiment of the present invention below in conjunction with accompanying drawing.
Asymmetric time slot ratio is provided with the influence to area interference
Being set to 2: 4 with asymmetric time slot ratio is example, illustrates that asymmetric time slot ratio is provided with the influence to area interference.Fig. 2 is that the asymmetric time slot ratio of TD-SCDMA network is provided with schematic diagram with under frequency and the inter-frequency networking situation.With reference to figure 1 as can be seen: no matter be that neighbor cell adopts with frequently or the alien frequencies setting, time slot configuration be 2: 4 cell base station BS1 to the cell base station BS2 and the BS3 of configuration in 3: 3, in time slot 3, all can have certain interference; Equally, time slot configuration be 3: 3 cell terminal UE to the sub-district UE of configuration in 2: 4, in time slot 3, can have certain interference.
Disturb between the base station in the time slot 3:
With reference to TD-SCDMA system basic link budget parameters:
Minimum coupling loss MCL:70dB between the base station;
The emission of fan antenna/reception overall gain (considering the influence of following hectare of antenna and smart antenna): 20dBi;
Macro base station single carrier maximum transmission power: 34dBm;
The average end, base station,, (having 4 more than the user) :-100dBm made an uproar;
Path loss model between the base station (dual slope model): PL (dB)=38.11+20 * log10 (R), R unit are rice.
When the neighbor cell employing of TD-SCDMA system is provided with frequency, only consider under the situation of the minimum coupling loss MCL between the base station, time slot configuration is that 3: 3 base station receives the base station interference that is configured to 2: 4 and is: 34-70=-36dBm in time slot 3, consider that the TD-SCDMA network base station can full power not launched under the usual condition, will there be the allowance about 5-10dB in above-mentioned Interference Estimation value.(having 4 more than the user)-100dBm that makes an uproar of the average end than the base station, the lifting of making an uproar of 3 ends of interfered base station time slot reaches more than the 50dB, will have a strong impact on the performance of system; When TD-SCDMA system neighbor cell adopts alien frequencies to be provided with, time slot configuration is that 3: 3 base station receives the base station interference that is configured to 2: 4 and is: 34-70-40=-76dBm in time slot 3, the lifting of making an uproar of 3 ends of interfered base station time slot reaches 20dB, cause the decline to a certain extent of TD-SCDMA performance, need take to disturb accordingly workaround.
When the neighbor cell employing of TD-SCDMA system is provided with frequency, the base station spacing of different time-gap configuration is under 800 meters the situation, path loss model between reference base station, time slot configuration is that 3: 3 base station receives the base station interference that is configured to 2: 4 and is: 34+20-97=-43dBm in time slot 3, the lifting of making an uproar of 3 ends of interfered base station time slot reaches 40dB, has a strong impact on the performance of system.When TD-SCDMA system neighbor cell adopts alien frequencies to be provided with, when the base station spacing of different time-gap configuration is 800 meters, time slot configuration is that 3: 3 base station receives the base station interference that is configured to 2: 4 and is: 34+20-97-40=-83dBm in time slot 3, lifting is made an uproar less than 10dB in 3 ends of interfered base station time slot, exists influence less to systematic function.
Disturb between the terminal in the time slot 3:
With reference to TD-SCDMA system basic link budget parameters:
MCL between the terminal (minimum coupling loss): 40dB;
Terminal maximum transmission power: 21dBm;
Terminal room path loss model: PL (dB)=38.11+20 * log10 (R), R unit are rice.
Terminal the 1st adjacent ACLR frequently (the adjacent ratio of leakage power frequently): 35dBm;
When TD-SCDMA system neighbor cell adopts when frequently being provided with, time slot configuration is that 2: 4 cell terminal receives the cell terminal that is configured to 3: 3 and disturbs and be: 21-40=-19dBm in time slot 3; When TD-SCDMA system neighbor cell adopted alien frequencies to be provided with, time slot configuration was that 2: 4 cell terminal receives the cell terminal that is configured to 3: 3 and disturbs and be: 21-40-35=-54dBm in time slot 3.Though the interference between the terminal is very serious, but this situation majority occurs in two is positioned at the switching band, belong to different districts simultaneously, use under the scene of time slot 3 again simultaneously, consider in the actual sets network process, the base station of N frequency (N=3) configuration is adopted in most base stations, the TD-SCDMA system has DCA (dynamic channel allocation) technology simultaneously, be configured to 2: 4 cell terminals, can be before disturbing increase gradually, dynamically be adjusted to other ascending time slot, the call drop of avoiding asymmetric time slot interference to cause on can be largely with carrier wave or different carrier.
The characteristics that adopt asymmetric time slot ratio to be provided with under the indoor environment
Along with the increase at full speed and the skyscraper of mobile communication subscriber in the city are more and more, traffic density and covering require also constantly to rise, particularly in 3G (Third Generation) Moblie, multi-medium data business above 60% will be in indoor generation, thereby the ability that improves indoor covering performance and professional ability, particularly data service is particularly important.For low rise buildings group (as: biotope) in blocks and the stronger building of outdoor signal transmission, can adopt the method in the covering chamber of indoor macro base station.But many architectural scale are big, quality good, and mobile telephone signal is had very strong shielding action, rely on outdoor covering can not solve indoor hot zones fully merely and cover and the telephone traffic problem, must adopt indoor distributed system to solve.
Fig. 3 is an indoor and outdoor different time-gap ratio TD-SCDMA network interferences schematic diagram, with reference to figure 3 as can be seen: use indoor stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU) as in the signal source TD-SCDMA indoor distributed system, when the asymmetric time slot ratio of indoor base station is set to 2: 4, outdoorly be set at 3: 3 o'clock, in time slot 3, only have of the interference of indoor base station downstream signal outdoor base station.In the design of TD-SCDMA indoor distributed system, outdoor leakage signal is carried out strict requirement, usually the indoor base station leakage signal intensity at outer 10 meters of building will be lower than more than the outdoor macro base station signal 10dB, and the TD-SCDMA indoor distributed system requires the outer 10 meters above test points of 95%-98% of building not surpass-95dBm usually.Because indoor signal still can't provide comparatively reasonably reference model in the propagation of indoor and outdoors, but in the reality test,, can't search indoor signal in the position of distance outdoor buildings 50m, to judge by the most weak adjacent cell signal, indoor signal can decay to-below the 120dBm.Consider that the outdoor base station antenna distance is capped building and can surpasses 50 meters usually, thereby when outdoor indoor base station was provided with frequency, the indoor base station leakage signal can be accepted to the influence of outdoor base station.When the indoor and outdoor alien frequencies is provided with, consider the TD-SCDMA base station first adjacent leakage power frequently than being 40dB, indoor signal continues to increase the attenuation of 40dB, and disturb and can ignore this moment.
When the asymmetric time slot ratio of indoor base station is set to 2: 4, outdoorly be set at 3: 3 o'clock, in time slot 3, there be of the interference of outdoor UE signal to indoor UE, consider in the actual sets network process, the base station of N frequency (N=3) configuration is adopted in most base stations, the TD-SCDMA system has DCA (dynamic channel allocation) technology simultaneously, be configured to 2: 4 cell terminals, can be before disturbing increase gradually, dynamically be adjusted to other ascending time slot, the call drop of avoiding asymmetric time slot interference to cause on can be largely with carrier wave or different carrier.
This shows: because the natural shielding action of interior architecture thing, the indoor distributed system that adheres to specification, when carrying out the design of asymmetric time slot ratio, the indoor base station signal is less to the influence of outdoor base station, the DCA function of TD-SCDMA system can be avoided to the full extent because the UE that asymmetric time slot causes disturbs call drop.
The method that the asymmetric time slot ratio of TD-SCDMA is provided with
Asymmetric time slot ratio setting of the present invention is the basic characteristics of disturbing according to the indoor and outdoor, according to the allocation ratio of the asymmetric time slot of outdoor TD-SCDMA network, the asymmetric time slot ratio of indoor base station is configured.Time slot configuration mode among the present invention does not relate to the concrete operation method of devices from different manufacturers time slot configuration, and only the ratio to concrete time slot configuration describes.
Basic step is as follows:
(1) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), be set under the situation of identical single-frequency point or the work of N frequency group, when indoor data traffic requirement is higher, because data service is most for the asymmetric business of up-downgoing, can be set to 2: 4 or 1: 5 by asymmetric time slot ratio;
(2) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of identical single-frequency point or N frequency group, further improve indoor data service ability if desired, can be set to 1: 5 by asymmetric time slot ratio;
(3) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of different single-frequency points or N frequency group, when indoor data traffic requirement is higher, because data service is most for the asymmetric business of up-downgoing, can be set to 2: 4 or 1: 5 by asymmetric time slot ratio;
(4) when single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station (little base station or macro base station) or distributed base station (as radio frequency remote unit RRU), when being set to the work of different single-frequency points or N frequency group, further improve indoor data service ability if desired, can be set to 1: 5 by asymmetric time slot ratio.
Method of the present invention is at the TD-SCDMA system with the asymmetric time slot ratio configuration of time slot; no matter the networking mode of single frequency point co-frequency, N frequency point co-frequency, single-frequency point alien frequencies or N frequency alien frequencies is adopted in the indoor and outdoor; indoor stand-alone base station or distributed base station (as radio frequency remote unit RRU) uplink and downlink timeslot ratio all belongs within protection scope of the present invention less than the configuration mode of outdoor base station uplink and downlink timeslot ratio.
Claims (7)
1. asymmetric time slot ratio method to set up of TD-SCDMA under indoor environment may further comprise the steps:
The big and indoor and outdoor inter base station interference features of smaller according to data traffic requirement in the indoor environment, the uplink and downlink timeslot ratio of indoor stand-alone base station or distributed base station is set to less than the setting of outdoor base station ratio.
2. the method for claim 1, wherein said stand-alone base station is little base station or macro base station.
3. the method for claim 1, wherein said distributed base station is a Remote Radio Unit.
4. the method for claim 1, the uplink and downlink timeslot ratio of wherein indoor stand-alone base station or distributed base station is set to comprise less than the step of outdoor base station ratio setting:
When single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station or distributed base station are set under the situation of identical single-frequency point or the work of N frequency group, when indoor data traffic requirement is higher, most according to data service is the asymmetric business features of up-downgoing, and asymmetric time slot ratio is set to 2: 4 or 1: 5.
5. the method for claim 1, the uplink and downlink timeslot ratio of wherein indoor stand-alone base station or distributed base station is set to comprise less than the step of outdoor base station ratio setting:
When single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station or distributed base station are when being set to identical single-frequency point or the work of N frequency group, according to the needs of the indoor data service ability of further raising, asymmetric time slot ratio is set to 1: 5.
6. the method for claim 1, the uplink and downlink timeslot ratio of wherein indoor stand-alone base station or distributed base station is set to comprise less than the step of outdoor base station ratio setting:
When single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 3: 3, and indoor single-frequency point or N frequency stand-alone base station or distributed base station are when being set to different single-frequency points or the work of N frequency group, when indoor data traffic requirement is higher, most according to data service is the asymmetric business features of up-downgoing, and asymmetric time slot ratio is set to 2: 4 or 1: 5.
7. the method for claim 1, the uplink and downlink timeslot ratio of wherein indoor stand-alone base station or distributed base station is set to comprise less than the step of outdoor base station ratio setting:
When single-frequency point or N frequency point networking are used in outdoor TD-SCDMA base station, if asymmetric time slot ratio is set to 2: 4, and indoor single-frequency point or N frequency stand-alone base station or distributed base station are when being set to different single-frequency points or the work of N frequency group, according to the needs of the indoor data service ability of further raising, asymmetric time slot ratio is set to 1: 5.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256346A (en) * | 2011-07-25 | 2011-11-23 | 中国移动通信集团山西有限公司 | Method, device and system for setting maximum transmitting power based on RRU (Radio Remote Unit) |
| CN101715196B (en) * | 2008-09-29 | 2012-05-23 | 杰脉通信技术(上海)有限公司 | Method for establishing single-carrier indoor base station |
| CN102546046A (en) * | 2010-12-29 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method and device for predicting interference of outdoor wireless network to indoor wireless network |
| CN102845088A (en) * | 2010-04-16 | 2012-12-26 | 京瓷株式会社 | Wireless communication system, high-power base station, low-power base station, and communication control method |
| CN104219728A (en) * | 2013-05-31 | 2014-12-17 | 中兴通讯股份有限公司 | Method, device and RNC (radio network controller) for deploying low-power base station in macro cell |
| WO2015074276A1 (en) * | 2013-11-25 | 2015-05-28 | 华为技术有限公司 | Method, system and device for determining dynamic uplink-downlink proportional configuration parameter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101715196B (en) * | 2008-09-29 | 2012-05-23 | 杰脉通信技术(上海)有限公司 | Method for establishing single-carrier indoor base station |
| CN102845088A (en) * | 2010-04-16 | 2012-12-26 | 京瓷株式会社 | Wireless communication system, high-power base station, low-power base station, and communication control method |
| CN102546046A (en) * | 2010-12-29 | 2012-07-04 | 中国联合网络通信集团有限公司 | Method and device for predicting interference of outdoor wireless network to indoor wireless network |
| CN102256346A (en) * | 2011-07-25 | 2011-11-23 | 中国移动通信集团山西有限公司 | Method, device and system for setting maximum transmitting power based on RRU (Radio Remote Unit) |
| CN102256346B (en) * | 2011-07-25 | 2014-02-12 | 中国移动通信集团山西有限公司 | A method, device and system for setting maximum transmission power based on RRU |
| CN104219728A (en) * | 2013-05-31 | 2014-12-17 | 中兴通讯股份有限公司 | Method, device and RNC (radio network controller) for deploying low-power base station in macro cell |
| WO2015074276A1 (en) * | 2013-11-25 | 2015-05-28 | 华为技术有限公司 | Method, system and device for determining dynamic uplink-downlink proportional configuration parameter |
| CN105264984A (en) * | 2013-11-25 | 2016-01-20 | 华为技术有限公司 | Method, system and device for determining dynamic uplink-downlink proportional configuration parameter |
| CN105264984B (en) * | 2013-11-25 | 2019-07-23 | 华为技术有限公司 | A kind of method, system and the equipment of determining dynamic uplink and downlink proportional arrangement parameter |
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Application publication date: 20080917 |