WCDMA Capacity Planning
Content
WCDMA system capacity planning
WCDMA network planning system, including core network planning and radio network planning in two areas, and wireless network planning can be divided into WCDMA radio resource planning, change planning, power control planning, capacity planning, coverage planning, and many other aspects, this article only for WCDMA system capacity planning to do a analysis. Also proposed to increase the capacity of WCDMA system specific method. Download Document on WCDMA Capacity Planning A, WCDMA system planning content 3G mobile communication to the stage of development, network operators encountered a lot of common problems, such as dropped calls when the user moves to a call channel not available, poor call quality. Business users enjoy the service depends on the quality of the wireless network planning. For operators, in terms of customer satisfaction in the benefit, the network planning is the key competitive factors. Compared with the second-generation mobile communications, third generation mobile system network introduces a large variety of bit operations, to predict the business model is difficult. Wireless network planning, including in each case link budget calculation, capacity and number of cell sites, while the base station coverage to predict the parameters of planning. In addition, you also need to plan the whole network, calculate the number of base stations for channel unit, transmission line capacity, base station controllers, the number of switches and other related units. In planning the introduction of performance measurement needs, such as call drop rate and occlusion of other indicators, use them to measure network performance. Uniformly in the cell coverage area to provide high-bit operations, providing low bit cell edge in the business. Continuous coverage designed to cover hot spots can also be covered. Different services, different implementation strategies need to be carefully estimated.
Second, WCDMA soft capacity system Number of channels required for the cell calculation, the available spectrum by the number of users forecast information to measure traffic density, the calculation conditions are given congestion rate, if the hardware caused by congestion, look-up table can be the result. If the maximum capacity is limited by the interference caused by its capacity is defined as soft capacity. For the soft capacity limited system, can not be calculated by the Irish list, because the total channel capacity is greater than the number of channels per cell. As part of the adjacent cell interference sharing, congestion rate in
Discuss RF optimization Issue At TelecomFunda
the same conditions, the system will serve more traffic. Less interference from adjacent areas, in the middle district of the more available channels. When the cell has a relatively small number of channels, high bit rate real-time user appears, the average load must be reduced to ensure low congestion rates. Since the average load reduction, so there are additional capacity available to the neighborhood use. This part of the capacity is borrowed from the neighboring cells, so interference sharing provides soft capacity. For high bit-rate real-time data users, such as image connections, providing soft capacity is essential. Online 3G Tutorial If the system user when there are fewer neighboring cells, in the WCDMA system is considered to increase the soft capacity. Soft capacity is defined as the condition of congestion in the soft Irish capacity increase. When the average cell has the same maximum number of channels, the soft blocking and hard blocking capacity increase compared to the amount of the Irish is: Irish Soft-capacity = capacity (soft congestion) / Irish capacity (hard congestion) -1 Since the WCDMA system, all users share the source of interference in the space channel analysis can not separate from the user interact with each other, causing transmission power changes, and these changes then lead to a new change, and so forth, mutual influence, and therefore prediction process is an iterative process, until stable. The size of the soft capacity also depends on the communication environment. If the adjacent cell load low, only the radio resource management algorithm in a cell can achieve high capacity in order to obtain soft capacity. If this algorithm is based on wideband interference and not throughput or number of connections, the system can achieve the soft capacity.
Third, WCDMA capacity is estimated 3G system is a wideband CDMA system, the network organization inherits the characteristics of narrow-band CDMA, the use of code division multiple access methods, frequency reuse is not an important aspect, so the network is interference from their own system, and at the same time the number of phone users related.
Discuss RF optimization Issue At TelecomFunda
WCDMA frequency reuse factor is 1, the system is interference limited system, so the real capacity is to estimate the amount of interference. The estimated load for the downlink, an important aspect of the letter is for the base station power estimate. The power referred to here as the average power, rather than the residential edge of the peak transmit power. For each user the minimum required power to the mobile station from the base station and mobile station average attenuation sensitivity of the decision, provided that there is no interference caused by multiple access (including outside the district and community). Enhance the interference caused by noise at least make the mobile station power requirements have increased more than the original, so the system can access the last number of users is reduced. For the uplink load estimates in the case of full-voice services, the relationship between the load factor can be simplified as: In the downlink capacity in UMTS is considered more important than the uplink capacity, it is because the asymmetric traffic, type of business are more concerned with the download. In 3G systems, the downlink capacity considerations are more factors that affect the bottom line of a different orthogonal code and the base station for the diversity. With long spreading codes in WCDMA downlink different area, different users in the uplink. The gold with 218 yards downstream, the code is cut into the frame period of 10ms, scrambling code 512 can be divided into 32 yards groups, each with 12 yards. Downlink capacity of orthogonal codes consider the use of irregular codes, the series of conditions in a path is orthogonal, multipath conditions in parts of orthogonality will disappear, and the community caused by mutual interference between users within the . Downlaod Document on RRC KPIs WCDMA spectral efficiency and link performance related, theoretical analysis and simulation show that the uplink capacity of the downlink capacity of 2 to 2.5 times. In addition to the base station using antenna diversity, the high-capacity mainly because of the uplink signal with a multi-user detection technology, compared with the general receiver provides almost 2 times the capacity. However, in the downlink, two base stations transmit signals to the same mobile station, and they are not orthogonal, multipath diversity can play a role. Through the analysis concluded: downlink than the uplink coverage is more dependent on the load, because the base station downlink total transmission power is shared by all users, 650kbit / s covering the following decision by the uplink capacity of the downstream decisions. The impact of environment on the capacity to increase the power under certain conditions, an increase of capacity, this is actually not the most effective. WCDMA spectral efficiency is defined as the bit rate under a certain number of
Discuss RF optimization Issue At TelecomFunda
simultaneous calls, while the more direct use in 3G cell 5MHz on the throughput of each said unit is kbit / s, cell, carrier. It consists of many factors, a great deal, and system simulation is also need to provide for certain conditions. In general, narrow-band single-carrier IS95 all traffic to the base station the number of channels up to 23, under 2% call blocking support 15.76Er1; single carrier per sector 3 sector base station traffic channel number up to 20, under 2% call blocking for each base station supports 39.54Er1. For the 3G WCDMA system, to provide a single carrier frequency channel OVSF code and scrambling code by the joint decision, and its relatively large capacity, currently offers 33 channels. Engineering design should be based on actual traffic demand for a reasonable distribution of the number of settings and reasonable allocation of the carrier frequency of each base station traffic channel number. Download WCDMA IRAT Handover Document. Fourth, network planning methods to improve the capacity of WCDMA site In practice, network planning, the increase in WCDMA downlink system capacity per base station site, there are several ways. 1. Enable the new carrier frequency, that is, a new frequency, by an increase in the second and third carrier to achieve the downlink capacity. WCDMA inter-frequency switching to support effective and can be achieved using multiple-carrier load balancing, you can increase the capacity of each site. 2. Using the power splitter, which can be assigned a sector of the power sector to more use, by reducing transmission power of each user to achieve the increased capacity of the site. In the first stage of network planning, site capacity needs to increase the sector of the uplink, but the sector may bring the results of the initial traffic density is greater than the required capacity. So the use of splitters to rely on an effective reduction of interference from the mobile station transmitting a feasible way to achieve the capacity increase. It is also an effective solution method for covering a specific terrain. 3. Made some use of antenna diversity. The so-called sub-set of hair, that is, in the downlink, the signal can be sent through the branches of the two base station antennas. Because of the mobile station, the small size and cheap is undoubtedly the direction of
Discuss RF optimization Issue At TelecomFunda
the public to pursue the use of two antennas and receiver circuits is not feasible. If the system is based on the feedback from the mobile station to send commands to adjust the antenna from two phase, the use of the mobile station receiving downlink diversity could be made coherent gain. Downlink sub-set of the downlink capacity increased to a certain extent, depending on the environment, the degree of multipath diversity. Can use less multipath diversity, the use of hair diversity gain access to the greater capacity of the downlink. No additional downlink antenna diversity to achieve. 4. Sector of base station sites can be used to effectively improve the capacity of a full upgrade to the station targeted to 3 sector base station, the capacity can be increased to 2.7 times the original; upgraded to 6 sectors, about 5.4 times the capacity increase. Sector to increase capacity by increasing and must be replaced for the directional antenna omnidirectional antenna, while the network re-planning and optimization. 5. In addition, the use of low bit rate coding mode may also improve the voice capacity of WCDMA systems.
Discuss RF optimization Issue At TelecomFunda
WCDMA network planning system, including core network planning and radio network planning in two areas, and wireless network planning can be divided into WCDMA radio resource planning, change planning, power control planning, capacity planning, coverage planning, and many other aspects, this article only for WCDMA system capacity planning to do a analysis. Also proposed to increase the capacity of WCDMA system specific method. Download Document on WCDMA Capacity Planning A, WCDMA system planning content 3G mobile communication to the stage of development, network operators encountered a lot of common problems, such as dropped calls when the user moves to a call channel not available, poor call quality. Business users enjoy the service depends on the quality of the wireless network planning. For operators, in terms of customer satisfaction in the benefit, the network planning is the key competitive factors. Compared with the second-generation mobile communications, third generation mobile system network introduces a large variety of bit operations, to predict the business model is difficult. Wireless network planning, including in each case link budget calculation, capacity and number of cell sites, while the base station coverage to predict the parameters of planning. In addition, you also need to plan the whole network, calculate the number of base stations for channel unit, transmission line capacity, base station controllers, the number of switches and other related units. In planning the introduction of performance measurement needs, such as call drop rate and occlusion of other indicators, use them to measure network performance. Uniformly in the cell coverage area to provide high-bit operations, providing low bit cell edge in the business. Continuous coverage designed to cover hot spots can also be covered. Different services, different implementation strategies need to be carefully estimated.
Second, WCDMA soft capacity system Number of channels required for the cell calculation, the available spectrum by the number of users forecast information to measure traffic density, the calculation conditions are given congestion rate, if the hardware caused by congestion, look-up table can be the result. If the maximum capacity is limited by the interference caused by its capacity is defined as soft capacity. For the soft capacity limited system, can not be calculated by the Irish list, because the total channel capacity is greater than the number of channels per cell. As part of the adjacent cell interference sharing, congestion rate in
Discuss RF optimization Issue At TelecomFunda
the same conditions, the system will serve more traffic. Less interference from adjacent areas, in the middle district of the more available channels. When the cell has a relatively small number of channels, high bit rate real-time user appears, the average load must be reduced to ensure low congestion rates. Since the average load reduction, so there are additional capacity available to the neighborhood use. This part of the capacity is borrowed from the neighboring cells, so interference sharing provides soft capacity. For high bit-rate real-time data users, such as image connections, providing soft capacity is essential. Online 3G Tutorial If the system user when there are fewer neighboring cells, in the WCDMA system is considered to increase the soft capacity. Soft capacity is defined as the condition of congestion in the soft Irish capacity increase. When the average cell has the same maximum number of channels, the soft blocking and hard blocking capacity increase compared to the amount of the Irish is: Irish Soft-capacity = capacity (soft congestion) / Irish capacity (hard congestion) -1 Since the WCDMA system, all users share the source of interference in the space channel analysis can not separate from the user interact with each other, causing transmission power changes, and these changes then lead to a new change, and so forth, mutual influence, and therefore prediction process is an iterative process, until stable. The size of the soft capacity also depends on the communication environment. If the adjacent cell load low, only the radio resource management algorithm in a cell can achieve high capacity in order to obtain soft capacity. If this algorithm is based on wideband interference and not throughput or number of connections, the system can achieve the soft capacity.
Third, WCDMA capacity is estimated 3G system is a wideband CDMA system, the network organization inherits the characteristics of narrow-band CDMA, the use of code division multiple access methods, frequency reuse is not an important aspect, so the network is interference from their own system, and at the same time the number of phone users related.
Discuss RF optimization Issue At TelecomFunda
WCDMA frequency reuse factor is 1, the system is interference limited system, so the real capacity is to estimate the amount of interference. The estimated load for the downlink, an important aspect of the letter is for the base station power estimate. The power referred to here as the average power, rather than the residential edge of the peak transmit power. For each user the minimum required power to the mobile station from the base station and mobile station average attenuation sensitivity of the decision, provided that there is no interference caused by multiple access (including outside the district and community). Enhance the interference caused by noise at least make the mobile station power requirements have increased more than the original, so the system can access the last number of users is reduced. For the uplink load estimates in the case of full-voice services, the relationship between the load factor can be simplified as: In the downlink capacity in UMTS is considered more important than the uplink capacity, it is because the asymmetric traffic, type of business are more concerned with the download. In 3G systems, the downlink capacity considerations are more factors that affect the bottom line of a different orthogonal code and the base station for the diversity. With long spreading codes in WCDMA downlink different area, different users in the uplink. The gold with 218 yards downstream, the code is cut into the frame period of 10ms, scrambling code 512 can be divided into 32 yards groups, each with 12 yards. Downlink capacity of orthogonal codes consider the use of irregular codes, the series of conditions in a path is orthogonal, multipath conditions in parts of orthogonality will disappear, and the community caused by mutual interference between users within the . Downlaod Document on RRC KPIs WCDMA spectral efficiency and link performance related, theoretical analysis and simulation show that the uplink capacity of the downlink capacity of 2 to 2.5 times. In addition to the base station using antenna diversity, the high-capacity mainly because of the uplink signal with a multi-user detection technology, compared with the general receiver provides almost 2 times the capacity. However, in the downlink, two base stations transmit signals to the same mobile station, and they are not orthogonal, multipath diversity can play a role. Through the analysis concluded: downlink than the uplink coverage is more dependent on the load, because the base station downlink total transmission power is shared by all users, 650kbit / s covering the following decision by the uplink capacity of the downstream decisions. The impact of environment on the capacity to increase the power under certain conditions, an increase of capacity, this is actually not the most effective. WCDMA spectral efficiency is defined as the bit rate under a certain number of
Discuss RF optimization Issue At TelecomFunda
simultaneous calls, while the more direct use in 3G cell 5MHz on the throughput of each said unit is kbit / s, cell, carrier. It consists of many factors, a great deal, and system simulation is also need to provide for certain conditions. In general, narrow-band single-carrier IS95 all traffic to the base station the number of channels up to 23, under 2% call blocking support 15.76Er1; single carrier per sector 3 sector base station traffic channel number up to 20, under 2% call blocking for each base station supports 39.54Er1. For the 3G WCDMA system, to provide a single carrier frequency channel OVSF code and scrambling code by the joint decision, and its relatively large capacity, currently offers 33 channels. Engineering design should be based on actual traffic demand for a reasonable distribution of the number of settings and reasonable allocation of the carrier frequency of each base station traffic channel number. Download WCDMA IRAT Handover Document. Fourth, network planning methods to improve the capacity of WCDMA site In practice, network planning, the increase in WCDMA downlink system capacity per base station site, there are several ways. 1. Enable the new carrier frequency, that is, a new frequency, by an increase in the second and third carrier to achieve the downlink capacity. WCDMA inter-frequency switching to support effective and can be achieved using multiple-carrier load balancing, you can increase the capacity of each site. 2. Using the power splitter, which can be assigned a sector of the power sector to more use, by reducing transmission power of each user to achieve the increased capacity of the site. In the first stage of network planning, site capacity needs to increase the sector of the uplink, but the sector may bring the results of the initial traffic density is greater than the required capacity. So the use of splitters to rely on an effective reduction of interference from the mobile station transmitting a feasible way to achieve the capacity increase. It is also an effective solution method for covering a specific terrain. 3. Made some use of antenna diversity. The so-called sub-set of hair, that is, in the downlink, the signal can be sent through the branches of the two base station antennas. Because of the mobile station, the small size and cheap is undoubtedly the direction of
Discuss RF optimization Issue At TelecomFunda
the public to pursue the use of two antennas and receiver circuits is not feasible. If the system is based on the feedback from the mobile station to send commands to adjust the antenna from two phase, the use of the mobile station receiving downlink diversity could be made coherent gain. Downlink sub-set of the downlink capacity increased to a certain extent, depending on the environment, the degree of multipath diversity. Can use less multipath diversity, the use of hair diversity gain access to the greater capacity of the downlink. No additional downlink antenna diversity to achieve. 4. Sector of base station sites can be used to effectively improve the capacity of a full upgrade to the station targeted to 3 sector base station, the capacity can be increased to 2.7 times the original; upgraded to 6 sectors, about 5.4 times the capacity increase. Sector to increase capacity by increasing and must be replaced for the directional antenna omnidirectional antenna, while the network re-planning and optimization. 5. In addition, the use of low bit rate coding mode may also improve the voice capacity of WCDMA systems.
Discuss RF optimization Issue At TelecomFunda
