EP3332586A1 - Verfahren zur steuerung der sendeleistung - Google Patents
Verfahren zur steuerung der sendeleistungInfo
- Publication number
- EP3332586A1 EP3332586A1 EP16751541.0A EP16751541A EP3332586A1 EP 3332586 A1 EP3332586 A1 EP 3332586A1 EP 16751541 A EP16751541 A EP 16751541A EP 3332586 A1 EP3332586 A1 EP 3332586A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transmission power
- transmitter
- signal
- histogram
- transmitters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
-
- 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
- H04W52/20—TPC being performed according to specific parameters using error rate
-
- 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
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
-
- 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
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
Definitions
- the invention relates to a method for controlling the transmission power (energy per symbol), with which in a communication system signals from transmitters of a group of multiple transmitters to a receiver assigned to this group of packets in accordance with a multiplex specification, in particular random access specification, transmitted.
- Random access is a technique for transmitting information over a transmission medium in which multiple terminals share the transmission medium. In random access techniques, there is no central control unit controlling access to the transmission medium.
- An example of a random access technique is the Aloha protocol, in which each subscriber sends his data packets at all times and asynchronously. If more than one participant simultaneously transmits, the data packets collide and may be lost.
- SSA Spread Spectrum Aloha
- SIC Successive Interference Cancellation
- Em pflinder w ith stores the received Em pflinder Wel lenform during a time window w ith a length T. Within this window begins Em pftician w ith the decoding of the pact with the highest E * / (N o + I). If the packet is successfully decoded, the receiver reconstructs the waveform from that packet and deletes it in its window. This will cancel the interference generated for all other packets. The receiver searches among those packages that are still present in his window, the package with the highest energy, decodes it and raises the interference, and the process is repeated until no white ⁇ more advanced packages are no longer present.
- SSA w ith SIC plays performance w ith covering different ⁇ nen packages em be p Nanodia, a central Rol le in the decoding process.
- the SIC can if all packets are m p Nanodia it the same power em, the load with respect to the standard decoding not raised stabili ⁇ hen.
- the SIC at the receiver can significantly increase the throughput of the SSA.
- Fig. 1 shows in the upper part the course of ⁇ over E / N (j n ⁇ -] B) fQ r ⁇ -] j e different participants.
- the lower part Fig. 1 shows the histogram of the ratio E / Q (in dB) Fig.
- L is the estimated attenuation suffered by the terminal in the backward link
- ⁇ SAT is the noise and interference power level at the receiver.
- K is defined as C / (N0 + I0)
- T is the target value for the desired ratio of C / (N0 + 10) at the satellite transponder input and GS Satellite antenna gain is in the edge area of the radiation coverage of the antenna on the ground, and • Rrand is a random value that is uniformly distributed between 0 and -mct.
- the parameter R-rnax is also calculated by the receiver and transmitted via the forward link to all terminals.
- S-MI M is a mobile satellite communication system, which is why after some time the terminal moves, the distance can be attenuated and the terminal can send.
- Fig. 3 shows the histogram of (in d B) for all packages using the power control technique described in [2]. From Fig. 3 it is obvious that the distribution of Es / N ⁇ ) (j nm jt, -] er , -jj e p a ⁇ ete is by far not a uniform distribution, there is a higher concentration of packets with low values of ⁇ / ⁇ , ⁇ ) (in d B). The reason for this is that it is impossible for the proportion q of subscribers experiencing attenuation by rain to have high values of (in dB).
- the second example assumes a satellite beam in the reverse link, where not all of the users use the same transmission mode (physical and link layer configuration). It is angenom men that two transmission modes are used, which use the same modulation and coding scheme nd be ⁇ and occupying the same transmission bandwidth. However, the USAGE ⁇ finished spreading factor is different for the two modes. In mode 0, a spreading factor 256 is used while in mode 1 a spreading factor 64 is used. It is further assumed that all terminals have the same maximum transmission power. When using the power control according to [2], one obtains the one shown in FIG. 4 shows a histogram of E ⁇ / NQ (in dB).
- the technique described in [2] is suitable for such mobile satellite communication operations where fade events are caused by the way to the satellite, e.g. B. is blocked by a building. As the participants move, fade events are generally short-lived. In other words, after a short time, there is a likelihood that the terminal will again be in an area with good propagation conditions.
- the technique described in [2] is not suitable for fixed satellite communications because the fade event can be long. Fade events are usually caused by rain, which can last for minutes or even hours. If the technique described in [2] is used, subscribers with "poor" propagation conditions may have to wait a long time before being able to transmit. On the other hand, their propagation conditions would be (still) good enough to achieve error-free transmission.
- the parameter is calculated on the basis of a random number and on the basis of probability values for the transmitters of the group within different specifiable power segments lying within the overall line area.
- a first table in which different transmit power segments of the total transmit power range each defined by a lower limit and an upper limit are provided, a second table containing for each transmit power segment a statistical probability value indicating how many transmitters are included within the one transmit power transmission segment,
- each probability value of the second table is assigned to a different transmission power segment, whereby the two tables define the expectation of how many transmitters of the group transmit signals with a transmission power lying within the respective transmission power segment,
- a random number is provided for each transmitter (either by the transmitter itself or from outside), calculated from the probability values to be assigned to the respective transmitters as their associated parameters, and to each transmitter being assigned the transmit power segment within which the transmit power with which that transmitter is transmitting , and
- the size of the transmission power with which the transmitter in question, within the transmission power segment associated with this transmitter is selected by another calculation based on a random number.
- each transmitter has a maximum transmission power
- each Transmitter is assigned to the transmission power segment within which its maximum transmission power lies
- that for each transmitter a random number calculated considering a uniform distribution to a predeterminable number space is provided (either from the transmitter itself or from outside), with the aid of the probability value for the latter determines whether the transmission power of the transmitter is between the lower limit of the relevant transmission power segment and a maximum transmission power or between the lower limit of the total transmission power range and its maximum transmission power.
- each transmitter has a maximum transmission power, that each transmitter is assigned to the transmission power segment within which its maximum transmission power lies, that a random number calculated taking into account a uniform distribution to a predeterminable number space is provided for each transmitter, which may be statistically equally distributed within the number space and in particular between zero and one, and that the transmitter concerned
- the transmitters can transmit in different modes, in particular with different transmission rates (bit rates), wherein per mode, the transmission powers of all transmitters are controlled as described above.
- bit rates transmission rates
- a transmitter of the group in the event that it is assigned a transmission power lying within a transmission power segment, which exceeds its allowable maximum transmission power, transmits with a transmission power between a predetermined minimum value and its maximum transmission power, namely viewed on a logarithmic scale substantially evenly distributed when the maximum transmission power is less than the lower limit of the relevant transmission power segment.
- This known power control scheme is for the reverse link of a communication system, where several terminals communicate with a communication node by means of a random access scheme. There are no defaults for the random access scheme; this might or might not be timed, use a spread or not, and it might or may not use replicas.
- the communication node may or may not use a use interference cancellation or any other type of multi-party detection.
- the terminals may use various physical and link layer (communication) configurations to transmit their data.
- the communication node sends two signaling tables, namely Table 1 and Table 2 to the terminals.
- Table 1 upper and lower E / I ⁇ o values are given in dB for respective transmit power segments.
- the probability values in Table 2 assume values between 0 and 1 and define the probabilities of how many transmitters transmit with transmit power within the respective segments.
- the terminals can the ratio of E b / 1 ⁇ Q au f cj he appreciated receiving end as a function of their transmission power.
- the terminals can calculate this estimate using an open-loop or closed-loop mechanism.
- the terminals then use these tables in the following manner to calculate their transmission power.
- the terminal estimates the maximum ratio ⁇ dj e it can reach at the communication node by using its maximum transmission power. With B is the maximum ratio jn dB, which can reach the terminal. The terminal generates a pseudorandom number t uniformly distributed between 0 and 1.
- the terminal determines what the largest n, n_max is for the B> If n_max is equal to u, the terminal sets n_max to u-1.
- the terminal calculates "its" Es / JSlu ratio at the receiver as follows:
- the number of modes can be arbitrary (it can be one or more).
- the number u of columns in the table can be fixed or variable.
- terminals send each time they estimate that they can satisfy E s / ⁇ o> - £ noi.
- the known method is characterized by the following properties:
- the communication node sends a table with u Values, which defines (u-1) - ⁇ - ⁇ o segments for each transmit mode.
- the communication node sends a table with (u-1) probability values of the use of each of the ⁇ No segments.
- the terminals arbitrarily choose a ⁇ by uniformly choosing their ⁇ no.
- the link of a device in the middle of the beam is 29 dB.
- the link budget loss due to the position of a terminal in the beam is ⁇ h and follows a uniform distribution (-6.0 dB).
- the terminal estimate of ⁇ ' h, Li has a Gaussian distribution in dB with a mean ⁇ f, and a standard deviation of 0.5 dB.
- a share of 25% of the terminals undergoes rain damping.
- the rain attenuation L r has a Gaussian distribution in dB with a mean value of -10 dB and a standard deviation of 1 dB.
- Rain damping L has a Gaussian distribution in dB and has a mean Lr and a standard deviation of 1 dB.
- Fig. 5 is a graph of Fig. 1 above ⁇ ⁇ o for the power control (broken line) described in [2] and the power control proposed by the known method (solid line) using the following signaling tables:
- the terminal sends a message with a transmission power Pa in dB over the random access channel.
- the terminal can also calculate B, the maximum Es / No given at the communication node.
- Example 2 consider a similar case as in Example 1, where there are no rain-attenuated terminals and there are two modes of transmission that use the same modulation and coding and occupy the same bandwidth, but mode 1 has a spreading factor of 256 and mode 2 has a spreading factor 64. Assuming a system with 1200 participants with the mode 1 and 300 participants with the mode 2.
- Fig. 6 is a diagram of Fig. 1 for Fig. 1 for the power control (broken line) described in [2] and the power control proposed by the known method (solid line) using the following signaling tables:
- the object of the invention is thus to further improve the known method according to [3].
- [3] are defined a number of parameters that must be communicated to the transmitters, and the way in which the transmitters their transmission power must calculate using the parameters. If the parameters "clean" are defined, the 1 vs curve can be controlled.
- terminals are thus meant the transmitters of a group consisting of several transmitters which transmit their signals to one of these group of transmitters associated receivers (for example, satellites) in packets in accordance with a multiplex specification, in particular a random access specification.
- a satellite assigned as a receiver to a group of transmitters sends one and the same signal to the transmitters of its group.
- the transmitters then return information to the satellite, namely packet according to a multiplex specification method.
- Fig. 1 shows ⁇ over Es / No and the histogram Es / No for a system in which all transmitters are decoded
- Fig. 2 shows ⁇ over Es / No and the histogram Es / No for a system in which some packets are lost
- Fig. 3 shows the histogram for Es / No for a setting in which some stations
- Fig. 4 shows a histogram of Es / No for a multi-mode setting
- Fig. 5 shows ⁇ over Es / No for Example 1, with the broken line ⁇ at
- Fig. 6 shows ⁇ over Es / No for a two-mode system, with the upper part of this figure corresponding to Mode 1 and the lower part to Mode 2, while the other figures show:
- FIG. 7 shows a block diagram for the general description of the invention
- FIG. 8 shows a first method 1 according to the invention
- FIG. 9 shows a second method 2 according to the invention implemented as a steep drop gradient method.
- 10 is a third method 3 of the invention implemented to maximize the maximum achievable load as a steep slope gradient method
- FIG. 11 shows the normalized histogram of the ratio Es / No with old and new power control parameters
- This method allows the calculation of "good" values for the power control parameters defined in [3].
- This method can be used in the reverse link of a communication system in which several transmitters communicate by means of a random access scheme with a communication node (also called hubs). There are no defaults for the random access scheme; this could or may not be slots, or using a spread, and it might or may not use replicas.
- the communication node may or may not use interference cancellation or any other type of multi-party detection.
- the transmitters can use various physical and link-layer configurations (transmit modes) to transmit their data.
- each transmitter must first define in which segment it is located.
- the station estimates its maximum achievable A, and assigns itself to the segment "I” if, and only if + l. In this case, it can be stated that the transmitter is listening to the segment "I".
- a pseudorandom number t is generated which is uniformly distributed between 0 and 1. If t> p 0 , i, the transmitter randomizes its transmission power to be at the receiver (in dB) uniformly between
- the transmitter randomizes its transmission power to be that at the receiver (in dB) uniformly between and A is distributed.
- the method described with this invention is based on the below explained assumption that the communication node knows the parameters in Table 1 and Table 2.
- the communication node can then transmit these parameters to the transmitters using the parameters for the power control defined in [3].
- the purpose of the method defined in this invention is that by using the new parameters, the ⁇ / ⁇ 'o distribution induced at the receiver will be "good” (high throughput and low burst loss rate).
- the communication node can determine if the system is near overloading or not.
- the method according to the invention works as follows.
- the burst decoder provides a histogram of the the received bursts.
- the histogram of ⁇ / ⁇ o is filtered.
- a low-pass filter (in the middle range) is preferred.
- the method 2 is performed on the initial estimate of be ⁇ Wundt. This gives a refined estimate of the Mo TO £ tr histogram.
- the method 3 is based on the final estimate of be ⁇ Wundt. This method provides at its output a set of control parameters and an estimate of the maximum load that can be achieved using these power control parameters.
- This method provides an estimate of the histogram of 'o m a. r based on the filtered histogram.
- a "custom filter” should be used whose impulse response is preferably in the shape of the left side of a bell-shaped curve.
- the / ⁇ ' ⁇ " ⁇ : ⁇ histogram is a filtered version of Z.
- the filter is preferably a low-pass filter.
- a "power control application” function is used which provides an estimate of the histogram after power control based on the ( -histogram
- Method 2 is a numerical optimization method which attempts to find the Es / Nomax that induces a histogram closest to the E / N histogram obtained from the burst demodulator (see Figure 7).
- the metric to be minimized is the Euclidean distance between the histograms (estimated one).
- optimization methods can be used, e.g. For example, high-waste gradient methods, simulated annealing, and genetic methods.
- the distance can be the Euclidean distance between the histograms.
- the procedure ends, at its output the estimate of the - Output histogram. Otherwise, the / ⁇ ⁇ " ⁇ £ ⁇ histogram is modified and the procedure moves to step 1.
- Z_k Z_k + (l-p_i) * Xj / (A1-A0 + 1)
- Z_k Z_k + (p_i) * Xj / (A2-A1 + 1)
- the estimated ⁇ / ⁇ 'o histogram is obtained by filtering Z with a filter whose impulse response corresponds to the left half of a bell-shaped curve as shown in FIG. Method 3
- Method 3 is a numerical optimization method that receives as input the estimated E s / N o m ax histogram. The method attempts to find the set of power control parameters that maximizes one of these two metrics:
- Fig. 10 an example of a high slope gradient method used to maximize the maximum achievable load is given. If the target load is not reached after a maximum number of iterations, the procedure is stopped.
- the invention can be defined by the following properties:
- the invention proposes a method which receives as input the E, / N () histogram of received bursts (packets) and provides as output a set of optimized power control parameters.
- the procedure can be divided into two steps:
- Step 1 This covers procedures 1 and 2. Based on the ⁇ ⁇ / ⁇ ' ⁇ histogram and knowing the set of power control parameters used by the transmitters, the Histogram estimated.
- the set of optimized power control parameters is obtained by:
- the link budget loss due to the position of a transmitter in the beam is and follows a uniform distribution (-6.0 dB).
- the transmitter estimate of ⁇ b, L ⁇ > has a Gaussian distribution in dB with a mean ⁇ b and a standard deviation of 0.5 dB.
- the rain attenuation L r has a Gaussian distribution in dB with a mean value of -10 dB and a standard deviation of 1 dB.
- the transmitter estimate of rain damping L r has a Gaussian distribution in dB and has an average and a standard deviation of 1 dB.
- the power control parameters are optimized to maximize the maximum achievable load.
- the set of optimized power control parameters is: Mode Es / No_i Es / No_2 Es / No_3 Es / No_4 Es / No_s Es / No_6 Es / No_ ⁇
- the set of optimized power control parameters is referred to herein as "new" power control parameters.
- Fig. 11 it can be seen that the ⁇ VNo histogram with the new power control parameters is closer to a uniform distribution than the histogram with the old power control parameters.
- FIG. 12 the curve of ⁇ V ⁇ vs of of ur ⁇ ea
- the power control method allows for a 32% increase in load.
- the invention can be used in wireless communication systems, such. In satellite communication systems and mobile communication systems. DIRECTORY OF ABBREVIATIONS
- ETSI TS 102 721-3 VI .2.1 "Satellite Earth Stations and Systems; Air Interface for S-band Mobile Interactive Multimedia (S-MIM); Part 3: Physical Layer Specification, Return Link Asynchronous Access.”
- EP 2 861 024 A1 (corresponding to DE 10 2013 221 866 A1)
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015215177.8A DE102015215177B3 (de) | 2015-08-07 | 2015-08-07 | Verfahren zur Steuerung der Sendeleistung |
PCT/EP2016/068563 WO2017025413A1 (de) | 2015-08-07 | 2016-08-03 | Verfahren zur steuerung der sendeleistung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3332586A1 true EP3332586A1 (de) | 2018-06-13 |
Family
ID=56686789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16751541.0A Withdrawn EP3332586A1 (de) | 2015-08-07 | 2016-08-03 | Verfahren zur steuerung der sendeleistung |
Country Status (5)
Country | Link |
---|---|
US (1) | US10225805B2 (de) |
EP (1) | EP3332586A1 (de) |
DE (1) | DE102015215177B3 (de) |
FR (1) | FR3039945B1 (de) |
WO (1) | WO2017025413A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10327123B1 (en) * | 2018-04-06 | 2019-06-18 | University Of South Florida | System and method for machine-to-machine communication in an internet-of-things network |
DE102020131214B3 (de) | 2020-11-25 | 2022-03-31 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zum Übertragen von Daten |
CN114745729A (zh) * | 2022-04-26 | 2022-07-12 | 上海中兴易联通讯股份有限公司 | 一种用于nr小基站prach基带合并的方法及装置 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6570876B1 (en) * | 1998-04-01 | 2003-05-27 | Hitachi, Ltd. | Packet switch and switching method for switching variable length packets |
GB9823396D0 (en) * | 1998-10-27 | 1998-12-23 | Roke Manor Research | Method of and apparatus for power control |
US6421327B1 (en) * | 1999-06-28 | 2002-07-16 | Qualcomm Incorporated | Method and apparatus for controlling transmission energy in a communication system employing orthogonal transmit diversity |
US6549755B2 (en) * | 2001-05-04 | 2003-04-15 | Glowlink Communications Technology, Inc. | Method and apparatus for monitoring and controlling gain compression in a transmitted signal |
US7184791B2 (en) * | 2002-09-23 | 2007-02-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods, receivers, and computer program products for determining transmission power control commands using biased interpretation |
US7340268B2 (en) * | 2003-02-26 | 2008-03-04 | Qualcomm Incorporated | Reliability determination and combining of power control commands received in a wireless communication system |
JP4365866B2 (ja) * | 2004-12-08 | 2009-11-18 | パナソニック株式会社 | 受信装置、集積回路、プログラムおよび受信方法 |
US20090036155A1 (en) * | 2007-08-01 | 2009-02-05 | Broadcom Corporation | E-HICH/E-RGCH adaptive threshold setting |
JP5227938B2 (ja) * | 2008-12-26 | 2013-07-03 | 株式会社エヌ・ティ・ティ・ドコモ | ユーザ装置及び移動通信方法 |
US8204100B2 (en) * | 2009-01-15 | 2012-06-19 | Lantiq Deutschland Gmbh | Methods and apparatuses for data transmission |
US8437300B2 (en) * | 2009-10-12 | 2013-05-07 | Samsung Electronics Co., Ltd | Method and system of multi-layer beamforming |
WO2011082145A2 (en) * | 2010-01-04 | 2011-07-07 | Atheros Communications, Inc. | Transmit power control |
US20170212210A1 (en) * | 2014-07-17 | 2017-07-27 | Origin Wireless, Inc. | Wireless positioning systems |
EP2861024B1 (de) * | 2013-10-09 | 2017-01-25 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zur Steuerung der Sendeleistung |
US9553683B2 (en) * | 2014-08-14 | 2017-01-24 | Broadcom Corporation | Upstream (US) transient impairment localization and detection within communication systems |
US20170141833A1 (en) * | 2015-01-23 | 2017-05-18 | Samsung Electronics Co., Ltd. | Method and device for supporting data communication in wireless communication system |
-
2015
- 2015-08-07 DE DE102015215177.8A patent/DE102015215177B3/de active Active
-
2016
- 2016-08-01 FR FR1657472A patent/FR3039945B1/fr not_active Expired - Fee Related
- 2016-08-03 EP EP16751541.0A patent/EP3332586A1/de not_active Withdrawn
- 2016-08-03 US US15/750,397 patent/US10225805B2/en active Active
- 2016-08-03 WO PCT/EP2016/068563 patent/WO2017025413A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20180234926A1 (en) | 2018-08-16 |
US10225805B2 (en) | 2019-03-05 |
FR3039945B1 (fr) | 2019-04-19 |
DE102015215177B3 (de) | 2016-11-10 |
WO2017025413A1 (de) | 2017-02-16 |
FR3039945A1 (fr) | 2017-02-10 |
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