CN102932886B - Method and device in telecommunication system - Google Patents
Method and device in telecommunication system Download PDFInfo
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- CN102932886B CN102932886B CN201210417765.6A CN201210417765A CN102932886B CN 102932886 B CN102932886 B CN 102932886B CN 201210417765 A CN201210417765 A CN 201210417765A CN 102932886 B CN102932886 B CN 102932886B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to an energy-saving method for implementing in-cell communication in a telecommunication system by at least one first base station. The first base station sends and receives a signal (23) with a frame structure in a cell; the frame structure comprises a downlink frame part (15) and an uplink frame part (16); each of the downlink frame part (15) and the uplink frame part (16) has capacity of distributing service flow flowing through the first base station between a telecommunication network and a user terminal to at least one data region (19 or 21) of at least one user or broadcast; and the downlink frame part (15) comprises an overhead part at least provided with synchronous information (17) or system information (18). The signal (23) (a frame N, a frame N+1, a frame N+2 and a frame N+3) with the frame structure is periodically sent according to a normal interval defined by a system. The method has the characteristic that in a power saving mode, the system increases an interval between the first signal (23) with the frame structure and a following second signal (23) with the frame structure to a power saving interval.
Description
Technical field
The present invention relates to the node in the telecommunication system for energy-conservation telecommunication system and preorder according to claim 12 of the power-economizing method in the telecommunication system of preorder according to claim 1, preorder according to claim 14.
Background technology
Mobile communication is one of most important technology of making contributions for worldwide social and economic development.Raising efficiency not only can reduce the impact on environment, and can also reduce network cost, this is benefited making the people of all use mobile systems.
Modern standard (such as WCDMA, LTE and WiMAX) has very large capacity in user and throughput, and this just needs a large amount of energy.In order to obtain high data throughout in the cellular system, need to arrange intensive community.Base station consumes sizable electric power, typically the annual 65000kWh in each base station.
Network design improves the key issue of efficiency.The network of inefficiency design can not be compensated in the efficiency high again of component-level.Such as, the quantity of radio station should be optimized for the coverage needing to obtain and quality.
In order to realize energy-saving design, need to consider some problems at the very start.First, need to consider real network needs.Before each website of consideration and specification of equipment, need to consider accurate coverage, capacity and quality.In addition, also to consider current or business environment needs in the future, consider the possibility rebuilding or expand website.Once consider these factors, operator just can start network design process, studies the design option of proprietorial resulting cost and alternative.
Capital expenditure generally only accounts for a very little part for proprietorial resulting cost.And the long-term saving brought by minimizing and the Effective Operation of website is very important, because can greatly reduce as the energy consumption of key issue.
Optimal solution for reducing energy consumption means to be needed to consider various problem.Even if like this, whole Networking Solutions & provisioned be still greater than their part and.This not necessarily obtains best result with regard to meaning best assembly to combine.In radio base station, the relative energy consumption of different assembly is along with performance different and different of the assembly from this assembly synergistic work.
Typical energy consumption source is in a base station signal transacting, RF conversion, power amplification, power supply, climate device (air-conditioning) and feed line.Such as, in traditional base station, equipment is arranged on the ground, and this just means needs the cable using several meters to be fed to antenna.The half possible loss of transmitting power is in feed lines (feeder).By equipment being placed on the top of tower, significantly energy consumption can be reduced.Equipment can be connected with battery backup unit minimize hardware and energy consumption.
The another kind of approach that can realize energy minimizing uses standby mode (stand-by mode).The scale of base station site is wanted to deal with rush hour.In one cell, multiple TRX (transmitter) can run simultaneously.Utilize power management scheme, at low traffice hours, some TRX can be made to be in holding state instead of to run at the idling mode.
Other approach reducing energy consumption is the needs avoided unnecessary DC/DC to change and reduce cooling fan and cooling system.Module based on digital power management also can reduce energy consumption.
Day by day need to provide the wireless technology with bandwidth capacities for cellular network.Good broadband system must meet certain standard, as high data rate and capacity, low every bit cost, good service quality and larger coverage.High-speed packet access (HSPA) and mobile WiMAX are the example of the two kinds of network access techniques supporting this standard.These two kinds of technology all use frame structure for the uplink and downlink communication between base station and mobile terminal.In the aft section of background technology, WiMAX technology is introduced as using the example of the technology of frame structure, but other technology such as WCDMA, GSM, HSPA and Long Term Evolution (LTE) also use frame structure.There is difference to a certain extent in the frame of different technologies.
WiMAX relates to IEEE 802-16 standard, and wherein mobile WiMAX relates to 802.16e-2005.Mobile WiMAX is the improvement of the modulation scheme used in previous (fixing) WiMAX, and mobile WiMAX introduces extendible OFDM access (SOFDMA) and carries data and be supported in channel width different frequency in frequency band (subchannel) with a large amount of subcarrier.These a large amount of subcarriers improve the performance of multipath fading channel.
Extendible OFDMA is Multiplexing Technology, and easily extensible refers to that communication channel is divided into the digital channel (subcarrier) of multiple variable bit rate or the ability of data flow.This means dynamic dispatching, wherein can be expanded and shrink by the time slot of base station assigns when accessing, but still keep distributing to specific mobile terminal.Can be that different user distributes the subcarrier of varying number, and due to subchannel variable, service quality can be controlled separately for each user, i.e. data rate and the probability of error.The bandwidth of channel can change between 1.25MHz and 20MHz.OFDMA (SOFDMA is based on OFDMA) has fixing subcarrier bandwidth.
OFDMA is multi-user's version of OFDM (OFDM) modulation scheme.Compared with OFDMA, OFDM is for single user.OFDM (A) uses a large amount of subcarriers, and wherein each subcarrier such as uses quadrature amplitude modulation (QAM) to modulate.OFDM has the ability of the severe channel condition of process, and this makes mobile WiMAX very robust.OFDM also has high spectrum efficiency.OFDM is regarded as using the narrow band signal of multiple slow modulation instead of using a broadband signal of modulating soon.No longer QAM is described further in this article.
The duplex method of mobile WiMAX is time division duplex (TDD).TDD only takies a channel, and uplink and downlink traffic carrying capacity distributes to different time slots.Utilize the multiple access access that the TDD of OFDMA supports subchannel and time slot for different user provides.TDD has advantage when the asymmetry of upstream data rate and downstream data rate is variable.When upstream data amount increases, can dynamically distribute more bandwidth for upstream data amount.
Fig. 1 shows the ability of the subchannel of OFDMA, and this diagrammaticalIy illustrates frame structure.Shown frame structure comprises multiple subchannel and multiple time slot, and the OFDMA as Multiplexing Technology supports this frame structure.Illustrate the data field 11,12,13,14 of different user devices 11,12,13,14 in the drawings.
The mobile WiMAX sent via base station uses the SOFDMA utilizing TDD.Fig. 2 shows when operating in tdd mode, for the more detailed schematic diagram of the frame structure of OFDMA.Frame (frame N) comprises descending sub frame 15, descending sub frame 15 sub-frame of uplink 16 below, the little protection interval (guard interval) 20 between descending sub frame and sub-frame of uplink and the end interval (end interval) 22 between sub-frame of uplink and the descending sub frame of next frame.In mobile WiMAX, these frames are that 5ms is long.The OFDMA that the support of some WiMAX system is run with frequency division multiplexing (FDD), in fdd, because uplink frame and downlink frame send on different carrier simultaneously, therefore frame structure is different from the frame structure in TDD.Because TDD allows the bandwidth between more shared uplink and downlink link, do not need paired frequency spectrum and have the reciprocal channel (reciprocal channel) that may be used for spatial manipulation, thus TDD is disposing being used for most WiMAX in the future.
Descending sub frame 15 in TDD is from Overhead, and this Overhead is used for the characteristic of notifying user equipment about system.This expense comprises synchronizing information 17 and system information 18.It is the data field 19 for downstream data traffic in descending sub frame after expense.Protection interval 20 is below for having the sub-frame of uplink 21 of data field (upstream data service for from different user devices).Be finally terminate interval 22, terminate the expense synchronizing information 17 that interval 22 is next frame below.
Particularly, in wimax expense from for physical layer procedure (cell detection, time and Frequency Synchronization) descending leading.This leading frame that there is provided frame configuration below controls header and is used for finding wherefrom and how carrying out the system information (modulation and coding mapping) of uplink and downlink decoding.Header and mapping is controlled for each available data field 19,22 transmission frame.
TDD can be replaced to divide sub-frame of uplink and descending sub frame with frequency division multiplexing (FDD).FDD is more effective under the service conditions of symmetry.Another advantage to make radio planning more easily also more effective.Compared with TDD, FDD utilizes frequency to divide subframe, this means to use different frequencies to send subframe at same time.
In order to obtain high data throughout in the cellular system, use high order modulation (as 64QAM) and large transmission power in base station.Keep physical resource at subcarrier and minimum to maximize user data-throughput in the time.Need high performance power amplifier to keep the performance of the signal after amplifying.Linear Amplifer is even more important.This just needs a lot of energy, adds the energy consumption of base station.Because these need, the efficiency comparison of amplifier is low, and materially increases the power consumption of base station.
Base station still needs transmitting system information 18 and synchronizing information 17 to serve the mobile terminal of connection and to make new mobile terminal can connecting system at underload or when not having load.These information must carry out with sufficiently high power all mobile terminals of sending to arrive in community, therefore send with low order of modulation and high power output.Because these send, the power consumption of base station is still very large.
Summary of the invention
The object of the invention is the energy efficiency improved for frame structure technology in base station.This object is by the power-economizing method in telecommunication system according to claim 1, according to claim 14ly realizes for energy-conservation telecommunication system and node in the telecommunication system according to claim 12.
Method according to the present invention relates to the method for saving energy in the telecommunication system, and this telecommunication system has at least one first base station to realize the communication in community.Sent in described community by described first base station and receive the signal with frame structure, the structure of this frame comprises downlink frame part and uplink frame part.Each frame part has the ability of carrying at least one data field, and this at least one data field is assigned at least one user between communication network and user terminal via the Business Stream of described first base station or is broadcasted.Described downlink frame part comprises the overhead part at least with synchronizing information or system information.Utilize the signal described in the normal interval of described system definition periodically sends with frame structure.The specific features of the method is that the described system interval had at least the first between the signal of frame structure and the second signal with frame structure is following closely increased to power and saves interval during power saving mode.
Node according to the present invention relates to node in the telecommunication system, and this telecommunication system has at least one first base station to realize the communication in community.Described system is suitable for sending in described community and receiving the signal with frame structure, and the structure of this frame comprises downlink frame part and uplink frame part thereafter.Each frame part has the ability of carrying at least one data field, and this at least one data field is assigned at least one user for the Business Stream via described first base station between communication network and user terminal or is broadcasted.Described downlink frame part comprises the overhead part at least with synchronizing information or system information.Described system is suitable for utilizing the signal described in the normal interval of described system definition periodically sends with frame structure.The specific features of described node is: described node is suitable for increasing during power saving mode at least the first and has interval between frame structure signal and the signal with the second frame structure following closely.
System according to the present invention relates to and has at least one first base station to realize the telecommunication system of communication in community.Described system is applicable to send in described community and receive the signal with frame structure, and the structure of this frame comprises downlink frame part and uplink frame part.Each frame part has the ability of carrying at least one data field, and this at least one data field is assigned at least one user for the Business Stream via described first base station between communication network and user terminal or is broadcasted.Described downlink frame part comprises the overhead part at least with synchronizing information or system information.Described system is applicable to utilize the signal periodically being sent described frame structure by the normal interval of described system definition.The specific features of described telecommunication system is: be applicable to increase during power saving mode at least the first and have interval between the signal of frame structure and the second signal with frame structure following closely.
Beneficial effect of the present invention is: by introducing power saving mode, utilizes and the method be easily incorporated in the current and following standard can reduce the power consumption of base station.
Accompanying drawing explanation
Hereinafter the present invention will be described in detail with reference to the accompanying drawings.These accompanying drawings are only for example but not for limiting the scope of the invention in any form.
Fig. 1 shows the schematic diagram of OFDMA frame structure.
Fig. 2 shows the more detailed schematic diagram for OFDMA frame structure when running in tdd mode.
Fig. 3 shows when having power saving mode and do not have power saving mode and sends from the signal of base station in underload situation.
Embodiment
Below with reference to being described in detail the present invention with execution mode illustrated in the accompanying drawings of describing in a specific embodiment.Fig. 1 and Fig. 2 is described background technology above.
Present embodiment proposes the power-economizing method in a kind of telecommunication system.Described telecommunication system and node are applicable to perform described method described herein.
Telecommunication system comprises at least one Shi community first base station that can realize communicating.Base station communicates with mobile subscriber terminal (as cell-phone).In this telecommunication system, this base station makes to realize communication between one or more mobile phone in community (community is by the geographic area of base station coverage) and this base station.
Sent in community by the first base station and receive the signal 23 with frame structure, the structure of frame comprises downlink frame part 15 and uplink frame part 16.
The execution mode relating to TDD shown in Fig. 2, comprises the frame part 15 of subframe form, the frame part 16 of frame part 15 below for being also subframe form.This frame structure in TDD is divided into descending sub frame, descending sub frame sub-frame of uplink below, the little protection interval 20 (see Fig. 2) between descending sub frame and sub-frame of uplink and the end interval 22 (see Fig. 2) between sub-frame of uplink and the descending sub frame of next frame.But, those skilled in the art is to be understood that, feature " frame part " in detail in the claims also comprise adopt the execution mode (in this embodiment, frame part divides according to frequency) of FDD or its adopt the execution mode of its duplex technology.
Each frame part has the ability of carrying at least one data field, and this at least one data field is assigned at least one user for the Business Stream via the first base station between communication network and user terminal or is broadcasted.Distribute at least one user or the fact that is broadcasted and mean the broadcast between unicast service stream, the multicast between system and one group of user terminal and each user terminal in system and broadcast domain between the system of present invention resides in and a user terminal.
Downlink frame part 15 comprises the overhead part 17,18 at least with synchronizing information or system information.Usual two kinds of information types 17,18 all comprise, but there is the selection only type in these types be included in expense.In any case, need to send at least one information in synchronous or system information.Therefore, term "or" is used.
As will be described in connection with fig. 2, downlink frame part 15 is from the Overhead had for notifying user equipment about the characteristic of system.This expense at least comprises synchronizing information 17 or system information 18.This synchronizing information is used between the first base station and user terminal, carry out the synchronous of time and frequency.
Described system information comprises Modulation and Coding Scheme and mapping, and this Modulation and Coding Scheme and mapping make it possible to the frame configuration realized between the first base station and user terminal.For the data field 19 of downstream data traffic, the uplink frame part 16 with data field 21 (upstream data service for from different user terminals) in downlink frame part 15 after this expense.As shown in Figure 3, from a signal to next signal, the size of data field 19,21 can change, and this is allow when utilizing OFDMA.
Fig. 3 illustrates the fact in the normal interval periodical transmission frame architecture signals 23,24 by system definition.Normal interval is 5ms in ofdma.As shown, there is frame frame N, is frame N+1, frame N+2 and frame N+3 etc. after frame N.
Execution mode (also relating to TDD) shown in Fig. 3, comprises the frame part 15 of subframe form, the frame part 16 of frame part 15 below for being also subframe form.But, those skilled in the art is to be understood that, feature " frame part " in detail in the claims also comprise adopt the execution mode (in this embodiment, frame part divides according to frequency) of FDD or its adopt the execution mode of its duplex technology.In fdd, this means that frame part can send simultaneously.
Even without comprising data field 19,21, also periodically send signal 23,24.At underload or when there is no load, the first base station still need at least transmitting system information 17 or synchronizing information 18 to serve the mobile terminal of connection and to make new mobile terminal can access this system.These information must carry out with sufficiently high power all mobile terminals of sending to arrive in community, therefore send with low order of modulation and high power output.Because these send, the power consumption of the first base station is still very large.
The object of the invention is to increase the energy efficiency in the base station adopting frame structure technology.Therefore, described by the characteristic of independent claims, scope of the present invention is that under power saving mode, the interval between at least the first frame structure signal 23 and next-door neighbour's the second frame structure signal 23 is thereafter increased to power saving interval by system, secondary signal (see Figure 23, lower part) is immediately following the next signal after the first signal.Overhead part to be included in the signal of each transmission and to save by described interval being increased to power the saving that interval realizes power.
Power saving interval can be realized by interrupting at least one the 3rd frame structure signal 24 (see Fig. 3, lower part).This means to save energy, interrupting at least one frame structure signal (being called the 3rd signal).Exemplarily, system can send three signals 23 and in after this interrupting 10 signals 24.These three signals in a line give user terminal and decode to the information (as UL mapping (enum) data) in overhead part 17,18, and to the time that the information that will send in UL frame part 21 processes.
Alternatively, power saving interval is realized by periodically interrupting frame structure signal 24.Further alternatively, frame structure signal is interrupted by breaking pin part 17,18.Such as each at least interruption secondary signal.This illustrates in the comparatively lower part of Fig. 3, wherein interval can be increased to 3 times by interruption two signal frame N+1 and frame N+2.Overhead part due to frame N+1 and frame N+2 utilizes enough power to send all mobile terminals arrived in community, and therefore such interruption will save a large amount of energy.
True or such, the signal of interruption comprises overhead part 17,18, and this overhead part is without the need to sending afterwards.Alternatively, only the data field (or multiple district) 19,21 of the signal interrupted is included in the frame of next signal of transmission.Shown in this signal 23 (part lower in see figure) in frame N+3, in wherein said signal, comprise the data field from frame N+1 and frame N+3 (the higher part see figure).
In specific run situation (as the quantity of user terminal and/or the statistics for the community utilization rate of time in the utilization rate level of cell capacity, community), system activates power saving mode.The intent of the present invention is continuous monitoring system, if traffic load declines within a period of time, then can activate power saving mode.The statistics for the traffic load of time is utilized also to be very useful.Such as, may be such, operator monitor from midnight to morning 6:00 night community traffic load low.Thus operator adjusts the operation of base station via management system, to activate power saving mode at night every day between midnight to 6:00.Also can adjustment System with make traffic load lower than during certain level activate power saving mode.Decide will provide which kind of service quality under a certain condition by operator.
Mobile terminal is known, and power saving mode is vital.Therefore, the overhead part of the frame structure signal sent during power saving mode includes the information about power saving mode and its character (as power saves interval).Such as can provide power and save interval in the administrative messag of the mapping of the frame of each transmission (as Downlink Channel Descriptor, a value or a code).
The overhead part of frame structure signal is carried out all mobile terminals sending to arrive in community with sufficiently high power, wherein send (multiple) data field.
Utilize the algorithm of loading system to control power saving mode with enable described energy method for saving.
The invention still further relates to the node in telecommunication system (there is at least one first base station to realize the communication in community).This system is used for sending in community and receiving the signal 23 with frame structure, and the structure of this frame (frame N, frame N+1, frame N+2, frame N+3) comprises downlink frame part 15 and downlink frame part 15 uplink frame part 16 below.Each frame part has the ability of carrying at least one data field 19,21, and this at least one data field is assigned at least one user for the Business Stream via the first base station between communication network and user terminal or is broadcasted.Downlink frame part 16 comprises the overhead part 17,18 at least with synchronizing information or system information.System is suitable for periodically sending this frame structure signal with the normal interval of this system definition.
The specific features of node is that it is applicable under power saving mode, increase the interval between at least the first frame structure signal 23 and next-door neighbour's the second frame structure signal 23 thereafter.System can comprise the algorithm controlling power saving mode.
The invention still further relates to and there is at least one first base station to realize the telecommunication system of the communication in community.This system is suitable for sending in community and receiving the signal 23 with frame structure, and the structure of this frame (frame N, frame N+1, frame N+2, frame N+3) comprises downlink frame part 15 and uplink frame part 16.Each frame part has the ability of carrying at least one data field 19,21, and this at least one data field is assigned at least one user for the Business Stream via the first base station between communication network and user terminal or is broadcasted.Downlink frame part 16 comprises the overhead part 17,18 at least with synchronizing information or system information.System is suitable for the normal interval of this system definition periodically transmission frame architecture signals.
The specific features of telecommunication system is that it is applicable under power saving mode, increase the interval between at least the first frame structure signal 23 and next-door neighbour's the second frame structure signal 23 thereafter.System can comprise the algorithm controlling power saving mode.
The technology of system is such as WiMAX, LTE, UMTS or GSM, and these are all the systems utilizing frame structure to run.Thus the system respectively with frame consumes a large amount of correlation energies relative to the present invention because of expense.As selection, system adopts OFDMA to run to make it possible to carry out multiple access access.System can adopt higher order modulation schemes as 64QAM.The algorithm of loading system controls power saving mode.
To those skilled in the art clearly, under the condition not departing from scope of the present invention, various modification can be made to above-mentioned execution mode.Possible modification only uses the power of expansion to save an interval for the uplink of base station down transmission and scheduling, but for random access attempts, the stand-by period be configured to when reducing power saving mode maintained the standard.
Claims (6)
1. a node in the telecommunication system, this telecommunication system has at least one first base station to realize the communication in community, comprising:
For sending in described community and receiving the device with the signal (23) of frame structure, wherein the structure of this frame comprises downlink frame part (15) and uplink frame part (16), each frame part (15, 16) have and carry at least one data field (19, 21) ability, this at least one data field is assigned at least one user for the Business Stream via described first base station between communication network and user terminal or is broadcasted, described downlink frame part (15) comprises the overhead part at least with synchronizing information (17) or system information (18),
For utilize the normal interval defined by described telecommunication system periodically send described in there is the device of the signal (23) of frame structure; And
For at least the first there is interval between the signal of frame structure and next-door neighbour the second signal (23) with frame structure thereafter during controlling power saving mode, be increased to make it device that power saves interval.
2. node according to claim 1, wherein said node comprises the algorithm controlling described power saving mode.
3. a telecommunication system, this telecommunication system has at least one first base station to realize the communication in community, and described telecommunication system comprises:
For sending in described community and receiving the device with the signal (23) of frame structure, wherein the structure of this frame comprises downlink frame part (15) and uplink frame part (16), each frame part (15, 16) have and carry at least one data field (19, 21) ability, this at least one data field is assigned at least one user for the Business Stream via described first base station between communication network and user terminal or is broadcasted, described downlink frame part (15) comprises the overhead part at least with synchronizing information (17) or system information (18),
For utilize the normal interval defined by described telecommunication system periodically send described in there is the device of the signal (23) of frame structure; And
For at least the first there is interval between the signal of frame structure and next-door neighbour the second signal (23) with frame structure thereafter during controlling power saving mode, be increased to make it device that power saves interval.
4. telecommunication system according to claim 3, the technology of wherein said telecommunication system is WiMAX, LTE, UMTS or GSM.
5. the telecommunication system according to any one of claim 3-4, wherein said telecommunication system runs with OFDMA to support that multiple access accesses.
6. the telecommunication system according to any one of claim 3-4, wherein said telecommunication system comprises the algorithm controlling described power saving mode.
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| CN104822136B (en) * | 2014-12-25 | 2018-02-13 | 平安科技（深圳）有限公司 | Broadcasting frequency control method and device |
| CN106686693B (en) * | 2015-11-06 | 2020-05-01 | 中国移动通信集团公司 | System information transmission method and device |
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| Hybrid Energy-Saving Algorithm Considering Silent Periods of VoIP Traffic for Mobile WiMAX;Hyun-Ho Choi等;《Proceedings of the 2007 IEEE International Conference on Communications(ICC 2007)》;20070628;第5951-5952页 * |
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