CN103118423A - Digital trunked system down power control method and device based on enhanced multimedia broadcast multicast service (eMBMS) - Google Patents
Digital trunked system down power control method and device based on enhanced multimedia broadcast multicast service (eMBMS) Download PDFInfo
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- CN103118423A CN103118423A CN2011103646572A CN201110364657A CN103118423A CN 103118423 A CN103118423 A CN 103118423A CN 2011103646572 A CN2011103646572 A CN 2011103646572A CN 201110364657 A CN201110364657 A CN 201110364657A CN 103118423 A CN103118423 A CN 103118423A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/322—Power control of broadcast channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/327—Power control of multicast channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
Abstract
The invention discloses a digital trunked system down power control method based on an enhanced multimedia broadcast multicast service (eMBMS). The digital trunked system down power control method includes that a single frequency network is divided into N power areas, and an initial sending power is arranged on each power area, each power area corresponding to the initial sending power is added in accordance with a central area of a community to an edge area of the community in sequence, the N is an integer which is greater than 2 or equal to 2; according to distributed situations of users in each power area, a down link initial sending power is ensured; according to changes of the maximum road damage of the users, the down link sending power is in tiny adjustment. With the help of the technical scheme, the initial sending power of the trunk service down link can be ensured quickly. And power changes of the users can be followed the tracks effectively. User experience is promoted. The invention further discloses a digital trunked system down power control device based on the eMBMS. The digital trunked system down power control device based on the eMBMS comprises a power area divided module, a down power determination module and a power adjustment module.
Description
Technical field
The invention belongs to communication technical field, the Poewr control method and the device that particularly relate to a kind of down link of the wideband digital trunked communication system based on eMBMS (Evolved Multimedia Broadcast Multicast Service, enhanced multimedia broadcast/multicast).
Background technology
LTE (Long Term Evolution, Long Term Evolution) is the mobile broadband network standard of future generation of 3GPP (Third Generation Partnership Project, 3-G (Generation Three mobile communication system) collaborative project) definition.Adopt OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology and introduce the technology such as MIMO (Multiple-Input Multiple-Out-put, the many outputs of many outputs); Simultaneously the 1.25-20MHz bandwidth be can support, peak data rate and power system capacity greatly improved; The network configuration of flattening has strengthened scheduling and Radio Resource control efficiency, has shortened the time delay that continues.
MBMS (Multimedia Broadcast Multicast Service, multimedia broadcast multi-broadcasting business) business is supported at No.3 generation mobile communication system, and framework eMBMS business in the 4th generation mobile communication LTE system is regarded as the business that application scenarios is arranged very much by industry.Its implementation is that the intelligent terminal with video capability receives the digital audio/video business of broadcast/group broadcast form by PMCH (Physical multicast channel, physics multicast channel).To eMBMS business realizing and networking mode, the 3GPP agreement has provided complete technical support.
The private wireless communication system that trunked communication system develops in order to satisfy industry user's command scheduling demand, use towards specific industry, but wireless user's sharing wireless channel in system, use take command scheduling as main body, be a kind of multipurpose, dynamical wireless communication system, and possess the characteristic of distinctive group calling function and short calling.
Trunked communication system in a government office, the market that has a wide range of applications, the field such as public safety, emergency communication, electric power, civil aviaton, petrochemical industry and army.Trunked communication system technically also will be broadband to the variation of system's IPization, business, data, the future development of terminal multimode.From concrete application point, be mainly reflected in high-speed data, video and be implemented in multiple application on this basis.
Therefore, trunked communication system need to possess efficient command scheduling characteristic, and requires network to have high reliability and fail safe.According to the group service characteristic, down link is broadcast transmission, and the non-right of speech user of group service is scattered in different districts at random, and the distance distance is also random.The down-link transmitting power user that is scattered at random towards the residential quarter is theaomni-directional transmission, and traditional Poewr control method can't work.
Therefore be necessary to seek a kind of new technical scheme, the downlink power based on the digital cluster system of eMBMS is control effectively.
Summary of the invention
The invention provides a kind of downlink power control method and device of the digital cluster system based on eMBMS, can't realize to solve traditional Poewr control method problem that the digital cluster system descending power based on eMBMS is control effectively.
The invention provides a kind of digital cluster system method for controlling downlink power based on eMBMS, comprising:
Single frequency network is divided into N power region, and for each power region arranges an initial transmission power, described initial transmission power corresponding to each power region is according to increasing successively from the center of housing estate district to the cell edge district, and N is the integer more than or equal to 2;
According to the distribution situation of user in each power region, determine the down link initial transmission power.
Further, the distribution situation of user in each power region, obtain as follows:
According to user's received power metrical information, obtain user's path loss;
According to user's path loss, obtain the distribution situation of user in each power region.
Further, according to the distribution situation of user in each power region, determine the down link initial transmission power, the method for employing can for:
With described initial transmission power corresponding to the highest power region of user's ratio as the down link initial transmission power.
Further, according to the distribution situation of user in each power region, determine the down link initial transmission power, the method for employing can also for:
And have the actual user to distribute and apart from described initial transmission power corresponding to center of housing estate power region farthest as the down link initial transmission power.
Further, according to the distribution situation of user in each power region, determine the down link initial transmission power, the method for employing can also for:
User's ratio of each power region is cumulative successively to the marginal zone from the center of housing estate district, when user's ratio that accumulated value satisfies the demands, with initial transmission power corresponding to last power region that is added up as the down link initial transmission power.
Further, according to the distribution situation of user in each power region, determine the down link initial transmission power, to realize in MCE (Multi-cell/multicast Coordination Entity, many cell/multicasts coordination entity) or eNodeB (evolved base station).
Further, the digital cluster system method for controlling downlink power based on eMBMS of the present invention also comprises:
In the power region corresponding according to described down link initial transmission power, the variation of the maximum path loss of user, adjust the down link transmitted power.
The present invention also provides a kind of digital cluster system downlink power control device based on eMBMS, comprising:
Power region is divided module, be used for single frequency network is divided into N power region, and for each power region arranges an initial transmission power, N is the integer more than or equal to 2;
The descending power determination module is used for according to the distribution situation of user in each power region, determines the down link initial transmission power.
Further, described descending power determination module specifically is used for, with described initial transmission power corresponding to the highest power region of user's ratio as the down link initial transmission power.
Further, described descending power determination module specifically is used for, with have the actual user to distribute and apart from described initial transmission power corresponding to center of housing estate power region farthest as the down link initial transmission power.
Further, described descending power determination module specifically is used for, user's ratio of each power region is cumulative successively to the marginal zone from the center of housing estate district, when user's ratio that accumulated value satisfies the demands, with initial transmission power corresponding to last power region that is added up as the down link initial transmission power.
Further, described digital cluster system downlink power control device based on eMBMS also comprises power regulation module, this module is used for the variation of the maximum path loss of the power region user corresponding according to described down link initial transmission power, and the down link transmitted power is adjusted.
Beneficial effect of the present invention is as follows:
The present invention is by being divided into single frequency network plural power region, and for arranging one, each power region satisfies the initial transmission power that this power region requires, then determine the initial transmission power of down link according to the distribution situation of user in each power region, and according to the variation of the maximum path loss of user, the transmitted power of down link is finely tuned, obtain more accurate down link transmission power value.Adopt technical solution of the present invention, can obtain fast the initial transmission power of group service PMCH channels downlink, and the power that can effectively follow the tracks of the user changes, adapt to the requirement that the cluster user downlink broadcast sends, improved the performance of trunked communication system, promote user's experience, reduced presence of intercell interference.
Description of drawings
Fig. 1 is the digital cluster system method for controlling downlink power flow chart based on eMBMS of the embodiment of the present invention;
Fig. 2 is that the single-frequency network area of the embodiment of the present invention is divided and the power division schematic diagram;
Fig. 3 is the digital cluster system downlink power control apparatus structure schematic diagram based on eMBMS of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
Embodiment of the method
According to embodiments of the invention, a kind of digital cluster system method for controlling downlink power based on eMBMS is provided, the method is divided into two above power region based on the group system single frequency network design of eMBMS with single frequency network, the corresponding class downlink transmission power grade of each power region.(this measured value can be the descending circuit loss value of terminal to report to the measured value that wireless network side is fed back by schooling group internal user, can be also the received power value that terminal records), the distribution situation of acquisition cluster service user power measurement values in regional on the PMCH channel, power control strategy by different scenes, obtain the down link initial gain value of PMCH channel, then by controlling cluster service user periodically or the reporting measurement value of Event triggered, according to certain assessment cycle, comprehensive assessment user's probability distribution, adjust the performance number of the descending transmission of PMCH channel.
Fig. 1 is the flow chart based on the digital cluster system method for controlling downlink power of eMBMS of the embodiment of the present invention, as shown in Figure 1, the present invention is based on the region allocation downlink power control method of eMBMS group system, specifically comprises the steps:
Step S101, after the single frequency network networking, the single frequency network overlay area is divided into several power region, each corresponding class power grade in zone, the corresponding power bracket of every class power grade, power bracket comprises maximum transmit power corresponding to this type of power grade, minimum transmit power and initial transmission power.Power corresponding to power grade is according to increasing successively from the center of housing estate district to the cell edge district, for example initial transmission power corresponding to each power region is according to increasing successively from the center of housing estate district to the cell edge district, this is to send because of the transmitted power that center of housing estate can be lower, the user just can normally receive, and cell edge need to send with relatively high power, and edge customer could correctly receive.The division of power region is saved as the power region distribution table.
Step S102 when the group service conversation initial is set up, uses the residential quarter maximum transmit power to send, and guarantees that all users can both correctly receive service signal.The residential quarter maximum transmit power is traditionally arranged to be the transmitted power that satisfies Cell Edge User.
Step S103, wireless network side is controlled cluster user periodically or event triggering feedback received power measurement result, and single frequency network eNodeB receives the measured value of reporting of user, and reports single frequency network MCE.MCE gathers the measured value of cluster service user, obtains the user at the area distribution table of single frequency network by measured value.
Step S104, wireless network side gathers assessment according to assessment cycle to the measurement result of intercepting the reporting of user on a certain physics multicast channel, according to the area distribution table of the user who obtains in single frequency network, determines the down initial transmitted power of PMCH channel.
In this embodiment, provide three kinds of concrete schemes to determine the down initial transmitted power of PMCH channel according to user profile table.
The first scheme is: calculate in whole single frequency network, cluster service user is in the user distribution ratio of each power region, with the down initial transmitted power of initial transmission power corresponding to the highest power region of user's ratio as the PMCH channel.
First scheme is: can correctly receive if need to satisfy all users, select to have the cluster user actual distribution and apart from the initial transmission power of center of housing estate power region farthest as downlink transmission power.
The third scheme is: if need to satisfy certain proportion user's demand, namely guarantee correctly downlink data receiving of certain proportion user, that the user distribution ratio of each power region is cumulative successively to the cell edge district from the center of housing estate district, the initial transmission power of last power region that is added up when selecting accumulated value more than or equal to demand percentage is as downlink transmission power.
Step S105, according to the measured value of upper line period or Event triggered feedback, the judgement user is in the changes in distribution situation of single frequency network, and the fine setting downlink transmission power.
If according to above-mentioned three kinds of schemes, the power region that the down link initial transmission power is corresponding does not change, namely according to the first scheme, the power region that user's ratio is the highest does not change; According to first scheme, the cluster user actual distribution is arranged and do not become apart from the power region of center of housing estate; According to the third scheme, last power region that accumulated value is added up during more than or equal to demand percentage does not become, and the variation of the maximum path loss of user in the power region corresponding according to the down link initial transmission power is finely tuned the down link transmitted power.If circuit loss value increases a step-length, the also power of a step-length of corresponding increase of downlink transmission power, if circuit loss value reduces by a step-length, the also power of a step-length of corresponding minimizing of downlink transmission power.
If change has occured the power region that the down link initial transmission power is corresponding, the method according to step S104 recomputates downlink transmission power.
The below is being divided into single frequency network three power region as example, and by reference to the accompanying drawings with two instantiations are described in further details the inventive method.
Fig. 2 is that the single-frequency network area of the embodiment of the present invention is divided and the power division schematic diagram, as shown in Figure 2,1 single frequency network that is comprised of 7 residential quarters, wherein each residential quarter is divided into three power region according to the power bracket that the user sends: center, mesozone and marginal zone.Each corresponding class transmitted power in zone, the center is the transmitted power category-A, and the mesozone is the transmitted power category-B, and the marginal zone is transmitted power C class.Three power are arranged as C＞B＞A from big to small.Initial transmission power, minimum transmit power and the maximum transmit power of this type of transmitted power are set respectively again in every class transmitted power, wherein initial transmission power is the arbitrary value between maximum transmit power and minimum transmit power, can be for example that maximum transmit power subtracts 3dB, perhaps minimum transmit power adds 3dB, specifically determines according to actual networking situation.
The cluster user metrical information that eNodeB gathers all cluster users or feeds back according to feedback request, and pass to MCE, MCE calculates the distributed areas of user in single frequency network that the PMCH channel carries above, according to the different application scene, selects a kind of Poewr control method based on region allocation.
Embodiment 1
For the scene of centralized group service, all users of carrying on MCE judgement PMCH channel only can take one or two residential quarters in single frequency network, and this moment, MCE notified eNodeB by control signal, was completed alone the power of PMCH channel by eNodeB and controlled.In 7 residential quarters of single frequency network as shown in Figure 2, if the user just concentrates and is distributed in one of them residential quarter, consider that single frequency network eNodeB's is energy-conservation, and the transmission of a residential quarter can be satisfied user's reception demand, only will there be the residential quarter of cluster user to carry out the transmission of descending power, and this transmitted power not above PMCH channel of other 6 residential quarters.
In this embodiment, the concrete implementation step of the inventive method is as follows:
S1: each microzonation is divided into three power region, i.e. center, mesozone and marginal zone, transmitted power is respectively A, B and C as mentioned above.When open loop sent, the power of open loop initialization was D.These four power are arranged as D 〉=C＞B＞A from big to small.For A, B, C class power, maximum transmit power, minimum transmit power and initial transmission power are set respectively.
S2: when the group service conversation initial was set up, descending use open loop initial transmission power D guaranteed that all cluster users can both correctly receive.
S3: the metrical information that the cluster user that carries above according to the PMCH channel feeds back obtains the path loss of cluster user, and then judges the user concentrates which power region that belongs to the residential quarter, and namely user's ratio of which power region is maximum.Be in the center if the user concentrates, change S3.1 over to, be in the marginal zone if the user concentrates, change S3.2 over to, otherwise, change S3.3 over to.
S3.1: the user concentrates and is in the center, adopts the initial transmission power in category-A to send;
S3.2: the user concentrates and is in the marginal zone, adopts the initial transmission power in the C class to send;
S3.3: the user concentrates the district that mediates, and adopts the initial transmission power in category-B to send;
S4: concentrate when user's continuous N frame to be in identical power region, according to the maximum path loss fine setting power that feeds back in cluster user metrical information in this power region, M is the integer more than or equal to 2, specifically comprises:
S4.1: when the maximum path loss of cluster user increases, transmitted power is increased delta (power adjustment step-length) 1, the increased power value is determined by actual conditions;
S4.2: when the maximum path loss of cluster user reduces, transmitted power is reduced delta2, power minimizing value is determined by actual conditions;
S4.3: when power is greater than the maximum transmit power of this power region after adjusting, send with the maximum transmit power of this power region; When power is less than the minimum transmit power of this power region after adjusting, send with the minimum transmit power of this power region.
S5: by cluster user cycle or Event triggered report measurement information, repeating step S3 and S4 obtain the downlink transmission power of PMCH channel.
Embodiment 2
Scene for the distributing group service, cluster user is dispersed in a plurality of residential quarters of single frequency network, this moment, MCE gathered user above the PMCH channel in the distribution situation of all residential quarters, and add up user's number of each power region, and determine the downlink transmission power of PMCH channel in the distribution situation of each power region according to the user, MCE is mapped as the power index with this performance number, issues each eNodeB.
In this embodiment, the concrete implementation step of the inventive method is as follows:
S1: cell set is divided into Three regions, i.e. center, mesozone and marginal zone.Each corresponding class transmitted power in zone, wherein, the center is the transmitted power category-A, and the mesozone is the transmitted power category-B, and the marginal zone is transmitted power C class.When open loop sent, the power of open loop initialization was D.These four power are arranged as D 〉=C＞B＞A from big to small.For A, B, C class power, maximum transmit power, minimum emissive power and initial transmission power are set respectively.
S2: when the group service conversation initial was set up, descending use open loop initial transmission power D guaranteed that all cluster group users can both correctly receive and parse the data that descending PMCH channel carries above.
S3:eNodeB receives cluster user feedback metrical information, and issues MCE and gather, and MCE calculates the power region distribution map of all users in the residential quarter according to the metrical information of cluster user feedback;
S4: by the user of carrying on the PMCH channel distribution situation in the different capacity zone, comprehensively calculate the downlink transmission power of PMCH channel, specifically comprise:
S4.1: the user of single frequency network all residential quarters of PMCH channel bearing is added up according to power region, obtain respectively total number of users of each power region of single frequency network;
S4.2: according to actual needs, select one of following three kinds of schemes to determine the down initial transmitted power of PMCH channel:
The first scheme: with the initial transmission power of the maximum power region of the number of users down initial transmitted power as the PMCH channel;
First scheme is: can correctly receive if need to satisfy all users, select to have the cluster user actual distribution and apart from the initial transmission power of center of housing estate power region farthest as downlink transmission power.
The third scheme is: if need to satisfy certain proportion user's demand, namely guarantee correctly downlink data receiving of certain proportion user, that the user distribution ratio of each power region is cumulative successively to the cell edge district from the center of housing estate district, the initial transmission power of last power region that is added up when selecting accumulated value more than or equal to demand percentage is as downlink transmission power.
S4.3: concentrate when cluster user continuous N frame to be in identical power region, according to the maximum path loss fine setting power that feeds back in cluster user metrical information in this power region, M is the integer more than or equal to 2, specifically comprise: S4.3.1: when the maximum path loss of cluster user increases, transmitted power is increased delta (power adjustment step-length) 1, and the increased power value is determined by actual conditions;
S4.3.2: when the maximum path loss of cluster user reduces, transmitted power is reduced delta2, power minimizing value is determined by actual conditions;
S4.3.3: when power is greater than the maximum transmit power of this power region after adjusting, send with the maximum transmit power of this power region; When power is less than the minimum transmit power of this power region after adjusting, send with the minimum transmit power of this power region.
S5: by cluster user cycle or Event triggered report measurement information, repeat the downlink transmission power that S3 and S4 obtain the PMCH channel.
Device embodiment
According to embodiments of the invention, a kind of digital cluster system downlink power control device based on eMBMS is provided, Fig. 3 is the structural representation based on the digital cluster system downlink power control device of eMBMS of the embodiment of the present invention, as shown in Figure 3, the digital cluster system downlink power control device based on eMBMS according to the embodiment of the present invention comprises power region division module 301 and descending power determination module 302 and power regulation module 303.Below the modules of the embodiment of the present invention is described in detail.
Particularly, power region is divided module 301 and is used for single frequency network is divided into N power region, and for each power region arranges an initial transmission power, N is the integer more than or equal to 2.
Descending power determination module 302 is used for according to the distribution situation of user in each power region, determines the down link initial transmission power.This module is carried out in MCE or eNodeB.
According to actual needs, descending power determination module 302 selects one of following three kinds of schemes to determine the down initial transmitted power of PMCH channel:
The first scheme: with the initial transmission power of the maximum power region of the number of users down initial transmitted power as the PMCH channel;
First scheme is: can correctly receive if need to satisfy all users, select to have the cluster user actual distribution and apart from the initial transmission power of center of housing estate power region farthest as downlink transmission power.
The third scheme is: if need to satisfy certain proportion user's demand, namely guarantee correctly downlink data receiving of certain proportion user, that the user distribution ratio of each power region is cumulative successively to the cell edge district from the center of housing estate district, the initial transmission power of last power region that is added up when selecting accumulated value more than or equal to demand percentage is as downlink transmission power.
Power regulation module 303 is used for the variation of the maximum path loss of the power region user corresponding according to the down link initial transmission power, and the down link transmitted power is adjusted.If according to above-mentioned three kinds of schemes, the power region that the down link initial transmission power is corresponding does not change, namely according to the first scheme, the power region that user's ratio is the highest does not change; According to first scheme, the cluster user actual distribution is arranged and do not become apart from the power region of center of housing estate; According to the third scheme, last power region that accumulated value is added up during more than or equal to demand percentage does not become, and the variation of the maximum path loss of user in the power region corresponding according to the down link initial transmission power is finely tuned the down link transmitted power.If circuit loss value increases a step-length, the also power of a step-length of corresponding increase of downlink transmission power, if circuit loss value reduces by a step-length, the also power of a step-length of corresponding minimizing of downlink transmission power.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it is also possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (12)
1. the digital cluster system method for controlling downlink power based on enhanced multimedia broadcast/multicast eMBMS, is characterized in that, comprising:
Single frequency network is divided into N power region, and for each power region arranges an initial transmission power, described initial transmission power corresponding to each power region is according to increasing successively from the center of housing estate district to the cell edge district, and N is the integer more than or equal to 2;
According to the distribution situation of user in each power region, determine the down link initial transmission power.
2. the digital cluster system method for controlling downlink power based on eMBMS as claimed in claim 1, is characterized in that, the distribution situation of user in each power region obtained as follows:
According to user's received power metrical information, obtain user's path loss;
According to user's path loss, obtain the distribution situation of user in each power region.
3. the digital cluster system method for controlling downlink power based on eMBMS as claimed in claim 1, is characterized in that, according to the distribution situation of user in each power region, determines the down link initial transmission power, and the method for employing is:
With described initial transmission power corresponding to the highest power region of user's ratio as the down link initial transmission power.
4. the digital cluster system method for controlling downlink power based on eMBMS as claimed in claim 1, is characterized in that, according to the distribution situation of user in each power region, determines the down link initial transmission power, and the method for employing is:
And have the actual user to distribute and apart from described initial transmission power corresponding to center of housing estate power region farthest as the down link initial transmission power.
5. the digital cluster system method for controlling downlink power based on eMBMS as claimed in claim 1, is characterized in that, according to the distribution situation of user in each power region, determines the down link initial transmission power, and the method for employing is:
User's ratio of each power region is cumulative successively to the marginal zone from the center of housing estate district, when user's ratio that accumulated value satisfies the demands, with initial transmission power corresponding to last power region that is added up as the down link initial transmission power.
6. the digital cluster system method for controlling downlink power based on eMBMS as claimed in claim 1, it is characterized in that, according to the distribution situation of user in each power region, determine the down link initial transmission power, realize in many cell/multicasts coordination entity MCE or evolved base station eNodeB.
7. the digital cluster system method for controlling downlink power based on eMBMS as described in any one in claim 1 to 6, is characterized in that, also comprises step:
In the power region corresponding according to described down link initial transmission power, the variation of the maximum path loss of user, adjust the down link transmitted power.
8. the digital cluster system downlink power control device based on enhanced multimedia broadcast/multicast eMBMS, is characterized in that, comprising:
Power region is divided module, be used for single frequency network is divided into N power region, and for each power region arranges an initial transmission power, N is the integer more than or equal to 2;
The descending power determination module is used for according to the distribution situation of user in each power region, determines the down link initial transmission power.
9. the digital cluster system downlink power control device based on eMBMS as claimed in claim 8, it is characterized in that, described descending power determination module specifically is used for, with described initial transmission power corresponding to the highest power region of user's ratio as the down link initial transmission power.
10. the digital cluster system downlink power control device based on eMBMS as claimed in claim 8, it is characterized in that, described descending power determination module specifically is used for, with have the actual user to distribute and apart from described initial transmission power corresponding to center of housing estate power region farthest as the down link initial transmission power.
11. the digital cluster system downlink power control device based on eMBMS as claimed in claim 8, it is characterized in that, described descending power determination module specifically is used for, user's ratio of each power region is cumulative successively to the marginal zone from the center of housing estate district, when user's ratio that accumulated value satisfies the demands, with initial transmission power corresponding to last power region that is added up as the down link initial transmission power.
12. the digital cluster system downlink power control device based on eMBMS as described in any one in claim 8 to 11, it is characterized in that, also comprise power regulation module, this module is used for the variation of the maximum path loss of the power region user corresponding according to described down link initial transmission power, and the down link transmitted power is adjusted.
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| WO2016015335A1 (en) * | 2014-08-01 | 2016-02-04 | Telefonaktiebolaget L M Ericsson (Publ) | Method implemented in mce for performing downlink power control for multicast or broadcast service and associated mce |
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