CN101114871A - Method for preventing power rise interfered by HSDPA indoor distribution system network - Google Patents
Method for preventing power rise interfered by HSDPA indoor distribution system network Download PDFInfo
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- CN101114871A CN101114871A CNA2006100890155A CN200610089015A CN101114871A CN 101114871 A CN101114871 A CN 101114871A CN A2006100890155 A CNA2006100890155 A CN A2006100890155A CN 200610089015 A CN200610089015 A CN 200610089015A CN 101114871 A CN101114871 A CN 101114871A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention relates to a method of preventing the soaring of an HSDPA indoor coverage system interference power, comprising the following steps: step one, the number of the floors, a needed value of the downstream power by the HSDPA user, a capacity value and an interference value of the district total power amplification are determined; step two, the number of the districts by splitting the planning system and the number of floors covered by every district are determined according to the number of the floors, a needed value of the downstream power by the HSDPA user, a capacity value and an interference value of the district total power amplification; step three, the planning system is divided according to the number of the districts and the number of floors covered by every district, a new district scrambling code allocated for every district and construct the indoor distribution system. By using the existing indoor distribution system as the carrier of the HSDPA indoor solution schedule, the invention adopts the district splitting to control the soaring of the power of the indoor distribution system, guarantees the total transmitting power, avoids disturbing the users on the other floors and correctly guarantees the flow demand of the HSDPA users on every floor.
Description
Technical Field
The present invention relates to a WCDMA (Wideband Code Division Multiple Access) system, and in particular, to a method for avoiding network interference power rise in an indoor distribution network after introducing a High Speed Downlink Packet Access (HSDPA).
Background
As the WCDMA protocol version evolves, the importance and urgency of network planning for HSDPA in network construction is becoming increasingly apparent. The HSDPA is used as an enhanced technology of a WCDMA system, makes up the deficiency of R99 service throughput, and improves the support capability of high-speed data users. The HSDPA target user group is mainly indoor users who have a large demand for data downloading, and users who have terminals in the form of notebooks and data cards will have a large proportion. Indoor network planning is therefore very important for HSDPA users.
Before the HSDPA technology is not introduced, there are relatively mature methods for indoor network planning for WCDMA R99 services, 2G services. For example, distributed antenna systems, picocells, and the like are used. At present, domestic mobile communication operators develop a large amount of 2G indoor coverage engineering construction, and the 2G network quality is improved to a great extent. In the existing indoor distribution system, the mode of a source + indoor distribution antenna system is a very common indoor coverage system mode. The typical composition of the system is that a signal source (such as a baseband pool or a microcell) is used as a signal source, a distributed antenna is arranged on each floor, the signal is uniformly distributed to each floor of a target building, and a power divider, a directional coupler, a combiner, a trunk amplifier and the like are adopted to compensate the attenuation of the signal during wiring. When the indoor load is heavy, the expansion is usually performed by adopting a cell splitting mode. The cell splitting technology is to reduce the control range of each base station by using the original network pattern and by using a mode of reducing the coverage distance, and improve the overall capacity of a network system, thereby achieving the purposes of reducing the capacity load of each single base station and allocating more baseband resources for each newly split cell. In WCDMA R99, 2G indoor coverage systems, cell splitting mainly solves the capacity problem. For example, in a building covered by GSM, a cell covers all floors in the early stage, and in the later stage, due to the increase of the number of users in the building, it is difficult to ensure normal communication of users in the building by using baseband resources of a cell. At the moment, baseband resources are required to be added, a feeder is modified in the indoor distribution system, a splitter is arranged, and the building is divided into 2 or more than 2 cells, so that each cell can use relatively more baseband resources to meet the user requirements in a relatively small range, and the purpose of capacity expansion of the indoor distribution system in a cell splitting mode is achieved.
In the initial stage of WCDMA network establishment, 2G shares a large part of users, so the demand for 3G services, especially data services, may not be large. But due to the introduction of WCDMA systems, and particularly HSDPA technology, technological possibilities are provided for a wider range of data download services. The download amount of indoor users in the future is likely to be huge, and even likely to replace cables, especially in hotels, restaurants and the like. The notebook with the built-in HSDPA card can become an absolute master, and later users will increasingly depend on HSDPA to surf the internet. Therefore, when an HSDPA indoor system is established, the evolution trend of the subsequent services needs to be fully considered.
In the existing WCDMA R99 plan, a cell covers multiple floors (as in fig. 1) with distributed antennas, sometimes up to a dozen floors belonging to the same scrambled cell. Therefore, after the HSDPA network planning is introduced on the basis of the original indoor distribution system, the existing distribution mode has larger limitation after the HSDPA is introduced. A significant feature of the distributed antenna coverage system is that an increase in the transmit power of one antenna causes an increase in the transmit power of the remaining antennas in the same cell. In the case of using the indoor distribution system by the WCDMA R99 voice users, since the required downlink transmission power of each voice user is small, the power ramp between different floors will not be large, which will not cause the over limit of the total power of the base station. However, because the transmission power of HSDPA is large and the traffic of each floor is large, if an indoor distributed antenna system covering multiple floors is used by directly borrowing the architecture of the original 2G indoor distributed system, the power increase of a single HSDPA distributed antenna may cause the overall power of the remaining antennas to be significantly increased, which may cause the problems of insufficient total transmission power, interference to users on other floors, and difficulty in accurately ensuring the traffic demand of HSDPA users on each floor. This greatly restricts the use of HSDPA in indoor distribution systems. In this case, the indoor distribution system may be power-limited due to interference limitation, because the indoor distribution system is not limited in capacity due to insufficient baseband resources, but is insufficient in power resources due to interference ramp-up. If the cell splitting method is considered to reduce the load in this case, the capacity and the baseband resource cannot be considered to be satisfied just like the 2G system, and it is necessary to further investigate whether the cell splitting can eliminate the interference ramp problem.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for avoiding the network interference power ramp of the HSDPA indoor distribution system, so as to avoid the coupling ramp of the indoor distribution antenna, ensure that the power amplifier works in a normal range, and provide power resources for more users.
In order to achieve the above object, the present invention provides a method for avoiding network interference power ramp-up in an HSDPA indoor distribution system, which is used in a planning system that adopts WCDMA HSDPA and applies an indoor distribution system, and includes:
step one, determining the number of floors of the planning system, a downlink power demand value and an interference value of an HSDPA user and a cell total power amplifier capacity value;
step two, determining the number of cells for splitting the cells of the planning system or the number of floors covered by each cell according to the number of floors of the planning system, the downlink power demand value of the HSDPA user, the total power amplifier capacity value of the cells and the interference value;
and step three, carrying out cell division on the planning system according to the number of the cells or the number of floors covered by each cell, distributing a new cell scrambling code for each cell, and constructing an indoor distribution system.
The step of determining the downlink power requirement value of the HSDPA user in the step one further includes:
and estimating the service rate required by the HSDPA user, and determining the downlink power requirement value of the HSDPA user according to the service rate.
The step of determining the interference value in the first step further comprises: and predicting a line loss value and an interference allowance climbing value of the planning system.
The step of determining the cell total power amplification capacity value in the first step further includes: according to the floor number of the planning system, the downlink power demand value and the interference value of the HSDPA user and according to a formula
The second step further comprises:
according to the floor number of the planning system, the downlink power demand value of the HSDPA user, the cell total power amplification capacity value and the interference value, and according to a formula
And calculating the minimum value of the number M of the cells into which the planned system is divided, wherein the minimum value of M is the number of the cells for splitting the planned system.
The invention utilizes the existing indoor distribution system as a carrier of HSDPA indoor solution, fully considers the pressure of power amplification caused by the problems of large power demand of HSDPA users, rising of coupling power of distributed antennas and the like, adopts a cell splitting mode to control the rising of the power of the indoor distribution system and enlarges the capacity. And besides, the number of cell splitting layers is calculated according to the interference, and the cell splitting calculation based on the capacity is also completed according to the service requirement of the planned floor. And (4) integrating the requirements of interference and capacity on cell splitting and determining the number of layers of the final split cell. Although the invention still adopts the cell splitting commonly used in the 2G system as an implementation means, when the cell splitting mode (the number of floors covered by each cell) is determined, the cell configuration condition of the planned building is comprehensively determined by considering not only the capacity limitation but also the current indoor interference condition and the power condition.
Drawings
Fig. 1 is a block diagram of a conventional WCDMA R99 plan covering multiple floors with distributed antennas;
fig. 2 is a flow chart of a planning method of an HSDPA indoor distribution system of the present invention;
fig. 3 is a structural diagram of an HSDPA indoor distribution system of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.
The invention adopts the cell splitting method to plan the indoor distribution system adopting the HSDPA, reduces the number of floors supported by each HSDPA cell so as to avoid interference power rising, and simultaneously expands the capacity of baseband resources aiming at the condition that the traffic of each floor is increased.
In the existing indoor distribution system, the whole planned floor belongs to a cell, and signals are uniformly distributed to each floor of the planned floor through distributed antennas arranged on each floor. The coupling characteristic of the distributed antenna is that each time an HSDPA user is added, the power of all floors of the cell is issued, so that the power demand of the power amplifier is increased. The power demand of HSDPA users is large, which further exacerbates the rising demand, and in addition, the power is easily out of range due to the increase of the traffic of each layer after HSDPA is used. Therefore, the invention adopts a cell splitting method to divide the planned floors into M cells so as to reduce the number of the floors covered by each HSDPA cell. Therefore, each HSDPA user is accessed to the coupling antenna which only affects the floor of the community, so that the power rising range is reduced, the coupling rising of indoor distributed antennas is controlled, the capacity of baseband resources is expanded, the power amplifier is ensured to work in a normal range, power resources are provided for more users, and the pressure of the power rising to the power amplifier is greatly reduced.
Although cell splitting is also used in current 2G indoor distribution systems, it only divides the cell splitting floors according to the capacity demand, because the power ramp effect is not significant in 2G. Therefore, when performing cell splitting in an indoor distribution system with HSDPA, it is necessary to consider both the capacity requirement as in 2G and the power rise due to the coupling effect of the indoor distribution antennas.
The invention sets the HSDPA indoor distribution system, firstly, the resource limit and the planning expected value planned in the HSDPA indoor are needed to be determined, such as the floor covered by the HSDPA service, whether the indoor distribution system, the power amplification resource, the HSDPA service volume and the like are adopted. These will be used as a basis for adjustment and reference in the planning process.
The process flow of the present invention is described in detail below with reference to fig. 2.
First, it is determined whether an indoor distributed antenna system is needed to be used as an indoor solution of wcdma hsdpa (step 201), for example, there are various ways such as Pico device networking and outdoor base station coverage indoor without using the existing indoor distributed antenna system. If employed, consideration is given to avoiding power ramping problems due to distributed antenna coupling. At the same time, the number of floors N that need to be covered by wcdma hsdpa indoors is determined by a field survey (step 202). In addition, the power required by the HSDPA user and the cell capacity need to be determined in advance. Estimate the roomThe expected service rate of HSDPA users in the network, and further estimating the downlink power resource needed by the mth HSDPA user of the nth floor, namely any user when reaching the expected downlink rate, and setting the downlink power resource as P HSDPA_User，n，m The value is the power value issued by the distributed antenna port of the floor where the HSDPA user is located. Meanwhile, the line loss value from the floor to the power amplifier is assumed to be L n Setting the power amplifier value configured by the baseband processing unit BBU centrally arranged in the planned system to be P total (step 203).
Setting the number of layers of the whole building as N layers, wherein each layer has m HSDPA users to carry out simultaneous downloading on average, I n If the interference margin is increased, the power resources of the system should meet the following formula under the conditions that the cell division is not performed and the power amplifier power does not exceed the boundary:
At this time, the formula 1 can be used to estimate P by using N obtained by field measurement or experience HSDPA_User，n，user 、L n 、I n Is calculated to obtain P total 。
In order to avoid the power increase of a single HSDPA distributed antenna from causing the overall power of the remaining antennas to be significantly increased, which may cause the problems of insufficient total transmission power, interference affecting users on other floors, and difficulty in accurately ensuring the traffic demand of the HSDPA user on each floor. The invention adopts a cell splitting method to further divide N layers of planned floors originally in a cell into M cells, thus the access of each HSDPA user only affects the coupling antenna of the floor of the cell, the power rising range is reduced, and the power consumption is as shown in a formula 2:
At this time, P is assumed to be obtained from N measured in the field HSDPA_User，n，m 、L n 、I n And by formula1 calculated P total The minimum number M of cells to be configured in the N floors can be determined by using the formula 2, so that the maximum number of floors covered by a single cell can be calculated correspondingly through N and M (step 204), and the minimum number of cells to be configured or the maximum number of floors covered by a single cell is a basis for cell splitting. Meanwhile, according to the comparison of the formulas 1 and 2 before and after the cell splitting, the same P is obtained total Since M is a positive integer, N > N/M, P in equation 2 HSDPA_User，n，m Can be larger than P in formula 1 HSDPA_User，n，m That is, the newly divided single cell can provide more power resources for HSDPA users, and can also bear more interference margin rise and line loss. Accordingly, the BBU may divide the cells for the indoor distribution system, reallocate the scrambling codes for different cells, and build an indoor distribution system (step 205). The layout after cell splitting is shown in figure 3. Originally, only one cell is in a building, the building is divided into 3 cells by the method of the invention, which can ensure the power amplifier to work in a normal range to the maximum extent and provide power resources for more users.
The application provides a method for preventing interference power of an HSDPA indoor distribution system from rising under the condition of not changing the indoor distribution system. The method has the advantages that a cell splitting mode is required for solving the HSDPA indoor coverage, and although cell splitting also exists in a 2G indoor system, the cell splitting in the case is based on capacity expansion consideration. The cell splitting in HSDPA is based on a comprehensive consideration of interference and capacity, and thus its algorithms for splitting cells are different. In short, if cell splitting is adopted in the 2G indoor network or the 3G R99 network, the capacity expansion is considered; in HSDPA, not only capacity requirements but also avoidance of interference ramp-up by cell splitting needs to be considered.
The above-described embodiments are provided to illustrate the features of the present invention and to enable those skilled in the art to understand the contents of the present invention and to implement the invention, and not to limit the scope of the present invention, so that equivalent modifications made without departing from the scope of the present invention are included in the claims described below.
Claims (5)
1. A method for avoiding the network interference power rise of HSDPA indoor distribution system is used in the planning system which adopts WCDMA HSDPA and applies the indoor distribution system, and is characterized in that the method comprises the following steps:
step one, determining the number of floors of the planning system, a downlink power demand value and an interference value of an HSDPA user and a cell total power amplifier capacity value;
step two, determining the number of cells for splitting the cells of the planning system or the number of floors covered by each cell according to the number of floors of the planning system, the downlink power demand value of the HSDPA user, the total power amplifier capacity value of the cells and the interference value;
and step three, carrying out cell division on the planning system according to the number of the cells or the number of floors covered by each cell, distributing a new cell scrambling code for each cell, and constructing an indoor distribution system.
2. The method of claim 1 wherein the step of determining the downlink power requirement value for the HSDPA user in step one further comprises:
and estimating the service rate required by the HSDPA user, and determining the downlink power requirement value of the HSDPA user according to the service rate.
3. The method of claim 1, wherein the step of determining the interference value in the first step further comprises: and predicting a line loss value and an interference margin climbing value of the planning system.
4. The method of claim 1, 2 or 3, wherein the step of determining the cell total power amplifier capacity value in the first step further comprises: according to the floor number of the planning system, the downlink power demand value and the interference value of the HSDPA user and according to a formula
5. The method of claim 4, wherein step two further comprises:
according to the floor number of the planning system, the downlink power demand value of the HSDPA user, the cell total power amplification capacity value and the interference value, and according to a formula
And calculating the minimum value of the number M of the cells into which the planned system is divided, wherein the minimum value of M is the number of the cells for splitting the planned system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742662B (en) * | 2008-11-04 | 2012-06-27 | 鼎桥通信技术有限公司 | Method for space division of HSDPA in multi-channel system |
| CN112437446A (en) * | 2020-11-09 | 2021-03-02 | 中国联合网络通信集团有限公司 | Method and device for distinguishing multi-layer cell division cells, electronic equipment and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100575434B1 (en) * | 2003-11-19 | 2006-05-03 | 한국전자통신연구원 | Method for resource space partition and a physical channel assignment in cellular based on ofdma |
| KR20060055930A (en) * | 2004-11-19 | 2006-05-24 | 엘지전자 주식회사 | Method for power decision of hsdpa in wcdma system |
| CN100397946C (en) * | 2004-12-28 | 2008-06-25 | 华为技术有限公司 | Method for allocating down going sharing channel in high speed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742662B (en) * | 2008-11-04 | 2012-06-27 | 鼎桥通信技术有限公司 | Method for space division of HSDPA in multi-channel system |
| CN112437446A (en) * | 2020-11-09 | 2021-03-02 | 中国联合网络通信集团有限公司 | Method and device for distinguishing multi-layer cell division cells, electronic equipment and storage medium |
| CN112437446B (en) * | 2020-11-09 | 2022-11-01 | 中国联合网络通信集团有限公司 | Method and device for distinguishing multi-layer cell division cells, electronic equipment and storage medium |
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