CN103179654B - PRACH determining method of launch power and device - Google Patents
PRACH determining method of launch power and device Download PDFInfo
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- CN103179654B CN103179654B CN201110441806.0A CN201110441806A CN103179654B CN 103179654 B CN103179654 B CN 103179654B CN 201110441806 A CN201110441806 A CN 201110441806A CN 103179654 B CN103179654 B CN 103179654B
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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
- H04W52/325—Power control of control or pilot 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
- H04W52/16—Deriving transmission power values from another channel
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Abstract
The invention provides the determining method of launch power of PRACH a kind of and device, this method includes：Obtain RACH power bias offset；PRACH transmission power is determined using the offset.By the present invention, PRACH transmission power is determined using the offset got, solve that PRACH transmission powers in correlation technique determine it is inaccurate the problem of, and then reached the accuracy rate for improving PRACH transmission powers, and optimize the effect of systematic function.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of PRACH determining method of launch power and device.
Background technology
The uplink physical channel of Long Term Evolution (Long Term Evolution, referred to as LTE) system includes physical accidental
Access channel (Physical Random Access Channel, referred to as PRACH), Physical Uplink Shared Channel
(Physical Uplink Shared Channel, referred to as PUSCH), Physical Uplink Control Channel (Physical Uplink
Control Channel, referred to as PUCCH).The effect of wherein PRACH channels, which is mainly, realizes uplink synchronous and cell switching.
LTE up use DFT-S-OFDMA (DFT-Spread OFDM, DFT extensions OFDM) technology, reference signal and data are logical
Cross what the mode of time division multiplexing (Time Division Multiplex, referred to as TDM) was multiplexed together.Uplink reference signals
It is divided into demodulated reference signal (Demodulation Reference Signal, referred to as DMRS) and detection reference signal
Sounding Reference Signal, referred to as SRS), wherein SRS main function is the measurement for up channel, just
In base station, (referred to as eNB) does frequency selective scheduling, is a kind of " broadband " reference signal.
In LTE system, because different user equipmenies (User Equipment, referred to as UE) is apart from eNB position
Difference, causes the time that multiple UE signals reach eNB also to differ.Real system is on the basis of eNB time, therefore just
Need to estimate the time delay that different UE reach base station, it is ensured that different UE signal is received in the same time by eNB.PRACH channels
Different UE are measured to the time delay of base station by sending targeting sequencing (preamble), realize uplink synchronous.Cut simultaneously in cell
During changing, PRACH channels realize being switched fast for minizone by sending targeting sequencing come synchronous target BS.User
Random access procedure between cell is divided into two kinds of competitive way and non-competing mode.Stochastic accessing mistake based on competitive way
Journey need to carry out hit-treatment, and the random access procedure based on non-competing mode then need not.
In order to meet senior International Telecommunication Union (International Telecommunication Union-
Advanced, referred to as ITU-Advanced) requirement, be used as senior long term evolution (the Long Term of LTE evolution standard
Evolution Advanced, referred to as LTE-A) system needs to support bigger system bandwidth (for example, highest can reach
100MHz), and the existing standards of backward compatibility LTE are needed., can be by the band of LTE system on the basis of existing LTE system
Width is combined to obtain bigger bandwidth, and this technology is referred to as carrier aggregation (Carrier Aggregation, referred to as CA)
Technology, the technology can improve IMT-Advance systems the availability of frequency spectrum, alleviate frequency spectrum resource it is in short supply, and then optimize frequency spectrum
The utilization of resource.
In the system of carrier aggregation is introduced, the carrier wave being polymerize is referred to as component carrier (Component
Carrier, referred to as CC), also referred to as one cell (Cell).It is also proposed that principal component carrier wave/cell (Primary
Component Carrier/Cell, referred to as PCC/PCell) and auxiliary component carrier/cell (Secondary Component
Carrier/Cell, referred to as SCC/SCell) concept, in the system for carrying out carrier aggregation, including at least one main point
Loading gage ripple and auxiliary component carrier, wherein principal component carrier wave are constantly in state of activation.
Because lte-a system introduces the concept of carrier aggregation, there is the possibility that multiple up channels are sent simultaneously, especially
It is on the premise of other cell have kept synchronization, when UE carries out random access procedure on SCell, it is necessary to
PRACH is sent on SCell.
The computing formula of up PRACH transmission powers in Rel-10 versions LTE protocol 36.213 is：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc}。
Wherein, PCMAX, c(i) it is the maximum transmission power that allows on current carrier.
PLcIt is the path loss that UE measurements are obtained on current carrier.
Wherein, PLcCalculation be that UE obtains publicly-owned reference signal (the Common Reference of high-rise configuration
Resource, referred to as CRS) after transmission power level referenceSignalPower, subtracted with referenceSignalPower
The high-rise filtered CRS receiving powers of process for going UE to receive, obtained value is UE path loss.I.e.：
PLc=referenceSignalPower-higher layer filtered RSRP.
Above-mentioned Reference Signal Received Power (Reference Signal Receiving Power, referred to as RSRP) is UE
By measuring the obtained actual receiving powers of CRS.
Above-mentioned higher layer filtered RSRP are that the high-rise filtered reference of passing through that above-mentioned UE is received is believed
Number power.
Wherein, for up SCell, the actual receiving powers of its CRS can be the actual reception work(of CRS on descending PCell
Rate or to should be on up SCell descending SCell the actual receiving powers of CRS, by high-rise configuration parameter
PathlossReferenceLinking is indicated.
PREAMBLE_RECEIVED_TARGET_POWER is the target received power for the preamble that eNB terminations are received,
Its computing formula is as follows：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep。
Wherein preambleInitialReceivedTargetPower is that the preamble initial targets of high-rise configuration connect
Receive power.
DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration.
PREAMBLE_TRANSMISSION_COUNTER is preamble transmission times.
PowerRampingStep is the power increment factor of high-rise configuration.
In distributed multi-antenna system or cooperative multipoint transmission (Coordinate multi-point
Transmission, abbreviation CoMP) in system, because the sending node and receiving node of the uplink and downlink signals at UE ends are possible to not
Unanimously, when the sending node and inconsistent receiving node of the uplink and downlink signals at UE ends, it will cause to be sent out according to descending sending node
The PL values and the uplink receiving node of reality that the reference signal sent is estimated be not larger to the PL value differences between UE, and due to
PRACH transmission power formula need to calculate the PL on current carrierc, therefore in CoMP system, when the uplink and downlink signals at UE ends
Sending node and receiving node it is inconsistent when, PRACH transmission power calculates inaccurate, causes PRACH to be successfully accessed rate drop
It is low, and then systematic function is influenceed, reduce system overall throughput.
It is not defined the PRACH transmission powers on SCell in existing Rel-10 versions LTE standard 36.213, and by
There may be larger difference in SCell and PCell channel circumstance, if therefore do not define the PRACH transmission powers on SCell,
And if the PRACH power on SCell is directly equal with PCell, now the PRACH transmission powers on SCell may be with SCell
Channel circumstance mismatch, can cause the PRACH on SCell be successfully accessed rate reduction, and then influence systematic function, reduce system
Overall throughput.
For PRACH transmission powers in correlation technique determine it is inaccurate the problem of, effective solve not yet is proposed at present
Scheme.
The content of the invention
For in correlation technique PRACH transmission powers determine it is inaccurate the problem of, the invention provides a kind of PRACH's
Determining method of launch power and device, at least to solve the above problems.
According to an aspect of the invention, there is provided a kind of PRACH determining method of launch power, including：Obtain with
Machine access power offset of channel offset；PRACH transmission power is determined using the offset.
Preferably, the transmission power for determining PRACH using the offset includes：The transmitting is determined using equation below
Power PPRACH：PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；
Wherein, PCMAX, c(i) be the user equipment (UE) allowed on subframe i on current carrier maximum transmission power, PLc
It is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER is evolved base station
The target received power for the lead code that eNB is received.
Preferably, the PREAMBLE_RECEIVED_TARGET_POWER is determined by below equation：PREAMBLE_
RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+
(PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the lead code initial target receiving power of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on lead code form of the high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is the transmission times of lead code, and powerRampingStep is the power increment factor of high-rise configuration.
Preferably, when sending the PRACH on auxiliary component cell SCell, PREAMBLE_RECEIVED_TARGET_
POWER is the target received power of the lead code received on principal component cell PCell；
PreambleInitialReceivedTargetPower is that the preamble initial targets of high-rise configuration on the PCell are received
Power；DELTA_PREAMBLE is the power bias amount based on preamble forms of the high-rise configuration on the PCell；
PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code on the PCell；PowerRampingStep is
The power increment factor of the high-rise configuration on the PCell.
Preferably, the PLcDetermined by below equation：
PLc=referenceSignalPower-higher layer filtered RSRP, wherein,
ReferenceSignalPower is UE by measuring the obtained actual receiving powers of reference measure signal CRS, higher
Layer filtered RSRP are the high-rise filtered reference signal power of process that the UE is received.
Preferably, obtaining offset includes：Obtain described by physical layer signaling or signaling for high-rise configuration
offset。
According to another aspect of the present invention there is provided a kind of determining device of PRACH transmission power, including：Obtain mould
Block, for obtaining RACH power bias offset；Determining module, for determining PRACH's using the offset
Transmission power.
Preferably, the determining module is used to determine the transmission power P using equation belowPRACH：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；Wherein,
PCMAX, c(i) be the user equipment (UE) allowed on subframe i on current carrier maximum transmission power, PLcIt is UE on current carrier
Obtained path loss is measured, PREAMBLE_RECEIVED_TARGET_POWER is the lead code that evolved base station eNB is received
Target received power.
Preferably, the PREAMBLE_RECEIVED_TARGET_POWER is determined by below equation：PREAMBLE_
RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+
(PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the lead code initial target receiving power of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on lead code form of the high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is the transmission times of lead code, and powerRampingStep is the power increment factor of high-rise configuration.
Preferably, when sending the PRACH on auxiliary component cell SCell, PREAMBLE_RECEIVED_TARGET_
POWER is the target received power of the lead code received on principal component cell PCell；
PreambleInitialReceivedTargetPower is that the preamble initial targets of high-rise configuration on the PCell are received
Power；DELTA_PREAMBLE is the power bias amount based on preamble forms of the high-rise configuration on the PCell；
PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code on the PCell；PowerRampingStep is
The power increment factor of the high-rise configuration on the PCell.
Preferably, the PLcDetermined by below equation：
PLc=referenceSignalPower-higher layer filtered RSRP, wherein,
ReferenceSignalPower is UE by measuring the obtained actual receiving powers of reference measure signal CRS, higher
Layer filtered RSRP are the high-rise filtered reference signal power of process that the UE is received.
By the present invention, PRACH transmission power is determined using the offset got, is solved in correlation technique
PRACH transmission powers determine it is inaccurate the problem of, and then reached the accuracy rate for improving PRACH transmission powers, and optimize and be
The effect for performance of uniting.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of PRACH according to embodiments of the present invention determining method of launch power；
Fig. 2 is the structured flowchart of the determining device of PRACH according to embodiments of the present invention transmission power；
Fig. 3 is the PRACH that uplink random access channel power control method according to embodiments of the present invention is used on SCell
The flow chart of transmission power calculating process；
Fig. 4 is that uplink random access channel power control method according to embodiments of the present invention is used in CoMP system
The flow chart of PRACH transmission power calculating process；And
Fig. 5 is the schematic diagram of PRACH according to embodiments of the present invention determining method of launch power application scenarios.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
In distributed multi-antenna system or CoMP system, sending node and reception due to the uplink and downlink signals at UE ends
Node is possible to inconsistent, when the sending node and inconsistent receiving node of the uplink and downlink signals at UE ends, will cause under
The PL values and the uplink receiving node of reality that the reference signal that row sending node is sent is estimated are other to the PL value differences between UE
It is larger, cause now PRACH transmission power to calculate inaccurate, cause PRACH to be successfully accessed rate reduction, and then influence systematicness
Can, reduce system overall throughput.In addition the PRACH transmission powers in the system of carrier aggregation on SCell may be with SCell's
Channel circumstance is mismatched, and the PRACH on SCell can be caused to be successfully accessed rate reduction, and then influences systematic function, and reduction system is whole
The problem of body throughput.
Based on this, a kind of PRACH determining method of launch power is present embodiments provided, this method can apply to
Among LTE and LTE-A (Long Term Evolution Advanced, senior 3GPP Long Term Evolutions), Fig. 1 is according to the present invention
The flow chart of the PRACH of embodiment determining method of launch power, as shown in figure 1, this method comprise the following steps S102 and
Step S104.
Step S102, obtains RACH power bias offset.
Step S104, PRACH transmission power is determined using offset.
By above-mentioned steps, it is determined that PRACH transmission power when, RACH power bias offset is subject to
Consider so that when the sending node of the uplink and downlink signals at UE ends is inconsistent with receiving node, PRACH transmission power is calculated more
Plus it is accurate, it the PRACH transmission powers on SCell and SCell channel circumstance is matched, so as to improve really
Determine the accuracy of PRACH transmission power, optimize systematic function.
When implementing, when determining PRACH transmission power using offset, it can be determined using default formula
PRACH transmission power, can also be improved the formula for the transmission power for determining PRACH at present, for example, using following public
Formula determines transmission power PPRACH：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；
Wherein, PCMAX, c(i) it is the maximum transmission power that allows on current carrier, PLcIt is that UE measurements are obtained on current carrier
Path loss, PREAMBLE_RECEIVED_TARGET_POWER is the target for the lead code that evolved base station eNB is received
Receiving power.Determine that PRACH transmission power is simple and practical in this way.
As one preferred embodiment, above-mentioned PREAMBLE_RECEIVED_TARGET_POWER can be by following
Formula is determined：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the preamble initial target receiving powers of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is lead code preamble transmission times, and powerRampingStep is the power increment factor of high-rise configuration.
Preferably, in above-mentioned preferred embodiment, when sending PRACH on auxiliary component cell SCell, it can use
The parameter for being exclusively used in SCell determines PREAMBLE_RECEIVED_TARGET_POWER, it would however also be possible to employ in existing formula
Parameter determines, for example：When the uplink random access channel power control method that the present embodiment is provided is used for carrier aggregation system
In SCell PRACH Power Controls when, above-mentioned configuration parameter：PREAMBLE_RECEIVED_TARGET_POWER、
PreambleInitialReceivedTargetPower, DELTA_PREAMBLE and PREAMBLE_TRANSMISSION_
COUNTER, powerRampingStep and preambleTransMax can be directly using the same parameters on PCell, can also
It is exclusively used in SCell PRACH control parameters accordingly for the PRACH transmission power controls separate configurations on SCell, for example,
PREAMBLE_RECEIVED_TARGET_POWER_s、preambleInitialReceivedTargetPower_s、DELTA_
PREAMBLE_s, PREAMBLE_TRANSMISSION_COUNTER_s and powerRampingStep_s and
preambleTransMax_s.PREAMBLE_RECEIVED_TARGET_POWER is determined using the parameter in existing formula
It is the saving time, workable.For example：PREAMBLE_RECEIVED_TARGET_POWER is to be connect on principal component cell PCell
The target received power of the lead code received；PreambleInitialReceivedTargetPower is that high level is matched somebody with somebody on PCell
The preamble initial target receiving powers put；DELTA_PREAMBLE be on PCell high-rise configuration based on preamble lattice
The power bias amount of formula；PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code on PCell；
PowerRampingStep is the power increment factor of high-rise configuration on PCell.
Preferably, the PL in above preferred embodimentcIt can be determined by below equation：PLc=
ReferenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is UE
By measuring the obtained actual receiving powers of reference measure signal CRS, higher layer filtered RSRP receive for UE
The high-rise filtered reference signal power of process arrived.
When implementing, obtaining RACH power bias offset mode has many kinds, preferred as one
Following easily operated implementation is provided in embodiment, the present embodiment：By eNB by signaling UE, for example, passing through
Physical layer signaling or signaling for high-rise configuration obtain offset.Wherein, above-mentioned physical layer signaling is to be carried on descending carrier
On physical layer signaling.
The up PRACH power determining methods that the present embodiment is provided, can be in distribution by offset effect
The PRACH transmit powers of UE in formula multiaerial system or CoMP system are adjusted, and realize PRACH transmission power meter
The accurate calculating calculated, improves the UE PRACH performance for being successfully accessed rate, optimizing system.
In addition, the effect that the up PRACH power determining methods that the present embodiment is provided pass through offset, additionally it is possible to right
PRACH transmission powers on SCell are adjusted, and realize the PRACH transmission powers on SCell and SCell channel circumstance
Matching, the PRACH for improving SCell is successfully accessed rate, improves systematic function.
In another embodiment, a kind of determination software of PRACH transmission power is additionally provided, the software is used to hold
Technical scheme described in row above-described embodiment and preferred embodiment.
In another embodiment, a kind of storage medium is additionally provided, is stored with above-mentioned PRACH's in the storage medium
The determination software of transmission power, the storage medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
The embodiment of the present invention additionally provides a kind of determining device of PRACH transmission power, the transmission power of the PRACH
Determining device can be used for the determining method of launch power and preferred embodiment for realizing above-mentioned PRACH, say
Bright, repeat no more, the module being related in the determining device of the transmission power of the PRACH is illustrated below.It is such as following
Used, term " module " can realize the combination of the software and/or hardware of predetermined function.Although described by following examples
System and method preferably realized with software, but hardware, or the combination of software and hardware realization be also may be simultaneously
It is contemplated.
Fig. 2 is the structured flowchart of the determining device of PRACH according to embodiments of the present invention transmission power, as shown in Fig. 2
The device includes：Acquisition module 22 and determining module 24, said structure is described in detail below.
Acquisition module 22, for obtaining RACH power bias offset；Determining module 24, is connected to acquisition mould
Block 22, the offset for being got using acquisition module 22 determines PRACH transmission power.
The present embodiment is by said apparatus, when determining PRACH transmission power using determining module 24, to acquisition module
The 22 RACH power bias offset got take in so that when the sending node of the uplink and downlink signals at UE ends
With receiving node it is inconsistent when, PRACH transmission power is accurately calculated, and the PRACH on SCell can additionally launched
Power and SCell channel circumstance match, so as to improve the accuracy for the transmission power for determining PRACH, improve system
Performance.
Above-mentioned determining module 24 is used to determine transmission power P using equation belowPRACH：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；
Wherein, PCMAX, c(i) it is the maximum transmission power that allows on current carrier, PLcIt is that UE measurements are obtained on current carrier
Path loss, PREAMBLE_RECEIVED_TARGET_POWER is the target for the lead code that evolved base station eNB is received
Receiving power.
Preferably, PREAMBLE_RECEIVED_TARGET_POWER is determined by below equation：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the preamble initial target receiving powers of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is the transmission times of lead code, and powerRampingStep is the power increment factor of high-rise configuration.
In addition, when sending PRACH on auxiliary component cell SCell, PREAMBLE_RECEIVED_TARGET_POWER is
The target received power of the lead code received on principal component cell PCell；
PreambleInitialReceivedTargetPower is that the preamble initial targets of high-rise configuration on PCell receive work(
Rate；DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration on PCell；PREAMBLE_
TRANSMISSION_COUNTER is the transmission times of lead code on PCell；PowerRampingStep is that high level is matched somebody with somebody on PCell
The power increment factor put.
Preferably, PLcIt can be determined by below equation：
PLc=referenceSignalPower-higher layer filtered RSRP, wherein,
ReferenceSignalPower is UE by measuring the obtained actual receiving powers of reference measure signal CRS, higher
Layer filtered RSRP are the high-rise filtered reference signal power of process that UE is received.
Illustrated below in conjunction with preferred embodiment, preferred embodiment below combines above-described embodiment and is preferable to carry out
Mode.
Preferred embodiment one：
A kind of PRACH determining method of launch power is present embodiments provided, two applications are divided into the present embodiment
Scene is described respectively.Specifically：
The application scenarios 1 of the present embodiment are：In distributed multi-antenna system or CoMP system, above and below UE ends
The sending node and receiving node of row signal are possible to inconsistent, when the sending node and receiving node of the uplink and downlink signals at UE ends
When inconsistent, the uplink receiving section of the PL values and reality that are estimated according to the reference signal that descending sending node is sent will be caused
Point is not larger to the PL value differences between UE, causes now PRACH transmission power to calculate inaccurate, causes PRACH to be successfully accessed
Rate is reduced, and then influences systematic function, reduces system overall throughput.
Fig. 3 is the PRACH that uplink random access channel power control method according to embodiments of the present invention is used on SCell
The flow chart of transmission power calculating process, as shown in figure 3, the flow chart comprises the following steps S302 to step S308.
Step S302：UE in CoMP system or distributing antenna system needs to send PRACH.
Step S304：RACH power bias offset is notified UE by eNB by signaling.
Step S306：UE calculates PRACH transmitting work(by the PRACH transmission powers computing formula provided in the present embodiment
Rate.
Step S308：The transmission power for the PRACH that UE is obtained according to calculating sends PRACH.
In the present embodiment, the UE under above-mentioned application scenarios 1 is when sending PRACH, due to distributed multi-antenna system
The PL values that the reference signal that UE is sent according to descending sending node in system or CoMP system is estimated connect with the up of reality
Receive node it is not larger to the PL value differences between UE, by it is proposed by the present invention increase in the power calculation of RACH with
The method that machine accesses power offset of channel, sends to the PRACH of the UE in distributed multi-antenna system or CoMP system
Power is adjusted, and is realized the accurate calculating that UE PRACH transmission power is calculated, is improved PRACH success rate, improve system
System performance.
The application scenarios 2 of the present embodiment are：In the system of carrier aggregation, when needing to carry out Stochastic accessing on SCell,
UE sends PRACH on SCell.The PRACH on SCell is not defined in existing Rel-10 versions LTE standard 36.213
Transmission power, and because SCell and PCell channel circumstance there may be larger difference, if therefore not defining on SCell
PRACH transmission powers, and if PRACH power on SCell is directly equal with PCell, the now PRACH transmittings on SCell
Power may be mismatched with SCell channel circumstance, the PRACH on SCell can be caused to be successfully accessed rate reduction, and then influence system
System performance, reduces system overall throughput.
Fig. 4 is that uplink random access channel power control method according to embodiments of the present invention is used in CoMP system
The flow chart of PRACH transmission power calculating process, as shown in figure 4, the flow chart comprises the following steps S402 to step S408.
Step S402：UE is needed to carry out Stochastic accessing on Scell, and PRACH transmission is carried out on Scell.
Step S404：RACH power bias offset is notified UE by eNB by signaling.
Step S406：The PRACH transmission powers computing formula that UE is provided by embodiment calculates the hair of PRACH on Scell
Penetrate power.
Step S408：The transmission power for the PRACH on Scell that UE is obtained according to calculating sends PRACH on Scell.
In the present embodiment, when the UE under above-mentioned application scenarios 2 sends PRACH on SCell, possible PRACH hairs
Power is penetrated with the unmatched situation of channel circumstance by proposed by the present invention in the power calculation of RACH to increase
Plus the method for RACH power bias, UE can realize the PRACH transmission powers on SCell and SCell channel ring
The matching in border, the PRACH for improving SCell is successfully accessed rate, improves systematic function.
Preferred embodiment two
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 1 of preferred embodiment one, and Fig. 5 is the determination side of PRACH according to embodiments of the present invention transmission power
The schematic diagram of method application scenarios, as shown in figure 5, there is two users in a serving cell, is designated as UE1 and UE2 respectively.Its
In, UE1 distance service cells eNB downlink path loss is designated as DL PL_1, the downlink path of UE2 distance service cell base stations
Loss is designated as DL PL_2.Two nearest LPN of user of distance are designated as LPN1, LPN2 respectively.LPN1 to UE1 up-link road
Footpath loss is designated as UL PL1, and LPN2 to UE2 uplink pathloss is designated as UL PL2.
In this example, it is assumed that in shown scene, UE1 uplink Node is LPN1, and downlink node
For service cell eNB, UE2 uplink Node is LPN2, and downlink node is service cell eNB.
Assuming that in shown scene, path loss DL PL_1 and the DL PL_2 of downlink are much larger than actual up letter
Path loss UL PL1 and the UL PL2 in road.
Preferably, it is assumed that UE now needs to send PRACH, then eNB will be random by the physical layer signaling on descending carrier
Access power offset of channel offset and notify UE, then UE can set PRACH transmission powers according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER
It is the target received power for the preamble that eNB terminations are received, than preferably, formula PREAMBLE_ identified below can be passed through
RECEIVED_TARGET_POWER：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep；
Wherein, preambleInitialReceivedTargetPower is that the high-rise preamble initial targets configured connect
Power is received, DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_
TRANSMISSION_COUNTER is preamble transmission times, and powerRampingStep is the power increment of high-rise configuration
The factor.
Preferred embodiment three
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 1 of preferred embodiment one, and Fig. 5 is the determination side of PRACH according to embodiments of the present invention transmission power
The schematic diagram of method application scenarios, as shown in figure 5, there is two users in a serving cell, is designated as UE1 and UE2 respectively.Its
In, UE1 distance service cells eNB downlink path loss is designated as DL PL_1, the downlink path of UE2 distance service cell base stations
Loss is designated as DL PL_2.Two nearest LPN of user of distance are designated as LPN1, LPN2 respectively.LPN1 to UE1 up-link road
Footpath loss is designated as UL PL1, and LPN2 to UE2 uplink pathloss is designated as UL PL2.
Assuming that in shown scene, UE1 uplink Node is LPN1, and downlink node is service cell eNB,
UE2 uplink Node is LPN2, and downlink node is service cell eNB
Assuming that in shown scene, path loss DL PL_1 and the DL PL_2 of downlink are much larger than actual up letter
Path loss UL PL1 and the UL PL2 in road.
In this example, it is assumed that UE now needs to send PRACH, then eNB by high-level signaling by RACH
Power bias offset notifies UE, then UE sets PRACH transmission powers according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER
It is the target received power for the preamble that eNB terminations are received, than preferably, its computing formula is as follows：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep。
In above-mentioned formula, at the beginning of preambleInitialReceivedTargetPower is the preamble of high-rise configuration
Beginning target received power, DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration,
PREAMBLE_TRANSMISSION_COUNTER is preamble transmission times, and powerRampingStep is high-rise configuration
The power increment factor.
Preferred embodiment four
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 2 of preferred embodiment one, and in the present embodiment, UE is configured with two descending carriers, and DL is designated as respectively
CC1 and DL CC2, UE are provided with two up-link carriers, and UL CC1 and UL CC2 are designated as respectively, and wherein UL CC1 are PCell,
UL CC2 are SCell.
Assuming that now UL CC1 are synchronized and activate, now UE needs to carry out Stochastic accessing on UL CC2, then UE
PRACH transmissions are carried out on UL CC2, now eNB by the physical layer signaling on DL CC1 by RACH power bias
Offset notifies UE, then UE sets the PRACH transmit powers on UL CC2 according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER
It is the target received power for the preamble that eNB terminations are received, than preferably, its computing formula is as follows：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is that the high-rise preamble initial targets configured connect
Power is received, DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_
TRANSMISSION_COUNTER is preamble transmission times, and powerRampingStep is the power increment of high-rise configuration
The factor.
Preferred embodiment five
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 2 of preferred embodiment one, and in the present embodiment, UE is configured with two descending carriers, and DL is designated as respectively
CC1 and DL CC2, UE are provided with two up-link carriers, and UL CC1 and UL CC2 are designated as respectively, and wherein UL CC1 are PCell,
ULCC2 is SCell.
Assuming that now UL CC1 are synchronized and activate, now UE needs to carry out Stochastic accessing on UL CC2, then UE
PRACH transmissions are carried out on UL CC2, now eNB is notified RACH power bias offset by high-level signaling
UE, then UE the PRACH transmit powers on UL CC2 are set according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER
It is the target received power for the preamble that eNB terminations are received, than preferably, REAMBLE_ can be determined using equation below
RECEIVED_TARGET_POWER：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is that the high-rise preamble initial targets configured connect
Power is received, DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_
TRANSMISSION_COUNTER is preamble transmission times, and powerRampingStep is the power increment of high-rise configuration
The factor.
Preferred embodiment six
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 2 of preferred embodiment one, and in the present embodiment, UE is configured with two descending carriers, and DL is designated as respectively
CC1 and DL CC2, UE are provided with two up-link carriers, and UL CC1 and UL CC2 are designated as respectively, and wherein UL CC1 are PCell,
ULCC2 is SCell.
Assuming that now UL CC1 are synchronized and activate, now UE needs to carry out Stochastic accessing on UL CC2, then UE
PRACH transmissions are carried out on UL CC2, now eNB by the physical layer signaling on DL CC2 by RACH power bias
Offset notifies UE, then UE sets the PRACH transmit powers on UL CC2 according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier, PREAMBLE_RECEIVED_TARGET_POWER
It is the target received power for the preamble that eNB terminations are received, than preferably, PREAMBLE_ can be determined by equation below
RECEIVED_TARGET_POWER：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+
DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is that the high-rise preamble initial targets configured connect
Power is received, DELTA_PREAMBLE is the power bias amount based on preamble forms of high-rise configuration, PREAMBLE_
TRANSMISSION_COUNTER is preamble transmission times, and powerRampingStep is the power increment of high-rise configuration
The factor.
Preferred embodiment seven
Present embodiments provide a kind of PRACH determining method of launch power, the application of the determination method of the present embodiment
Scene is the application scenarios 2 of preferred embodiment one, and in the present embodiment, UE is configured with two descending carriers, and DL is designated as respectively
CC1 and DL CC2, UE are provided with two up-link carriers, and UL CC1 and UL CC2 are designated as respectively, and wherein UL CC1 are PCell,
ULCC2 is SCell.
Assuming that now UL CC1 are synchronized and activate, now UE needs to carry out Stochastic accessing on UL CC2, then UE
PRACH transmissions are carried out on UL CC2, now eNB by the physical layer signaling on DL CC1 by RACH power bias
Offset notifies UE, then UE sets the PRACH transmit powers on UL CC2 according to the following equation：
PPRACH=min { PCMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER_s+PLc+offset}。
Wherein, offset passes through RACH power bias, P for UECMAX, c(i) it is to allow most on current carrier
Big transmission power, PLcIt is the path loss that UE measurements are obtained on current carrier.
Wherein, PREAMBLE_RECEIVED_TARGET_POWER_s be eNB termination receive aim in SCell
The target received power for the preamble that PRACH transmission power controls are configured, than that preferably, can be determined by equation below
PREAMBLE_RECEIVED_TARGET_POWER_s：
PREAMBLE_RECEIVED_TARGET_POWER_s=preambleInitialReceived TargetPower_
s+DELTA_PREAMBLE_s+(PREAMBLE_TRANSMISSION_COUNTER_s-1)*powerRampingStep_s
Wherein, preambleInitialReceivedTargetPower_s is that high-rise configuration is aimed in SCell
The preamble initial target receiving powers that PRACH transmission power controls are configured, DELTA_PREAMBLE_s is high-rise configuration
The power bias amount based on preamble forms that is configured of the PRACH transmission power controls aimed in SCell,
PREAMBLE_TRANSMISSION_COUNTER_s is that the PRACH transmission power controls aimed in SCell of high-rise configuration are matched somebody with somebody
The preamble put transmission times, powerRampingStep_s is the PRACH aimed in SCell the transmitting work(of high-rise configuration
Rate controls the configured power increment factor.
By above-described embodiment there is provided the determining method of launch power of PRACH a kind of and device, by according to random
The type of access procedure determines one or more up channels and signal to be sent, to ensure the PRACH channels on SCell
Effective access, while ensuring effective transmission of multiple up channels and signal on other cell.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be shown to be performed different from order herein
The step of going out or describe, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of Physical Random Access Channel PRACH determining method of launch power, it is characterised in that including：
Obtain RACH power bias offset；
PRACH transmission power is determined using the offset；
Wherein, the transmission power for determining PRACH using the offset includes：
The transmission power P is determined using equation belowPRACH：
PPRACH=min { PCMAX,c(i),PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；
Wherein, PCMAX,c(i) be the user equipment (UE) allowed on subframe i on current carrier maximum transmission power, PLcIt is current
The path loss that UE measurements are obtained on carrier wave, PREAMBLE_RECEIVED_TARGET_POWER is that evolved base station eNB is received
Lead code target received power.
2. according to the method described in claim 1, it is characterised in that the PREAMBLE_RECEIVED_TARGET_POWER leads to
Cross below equation determination：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_
PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER -1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the lead code initial target receiving power of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on lead code form of the high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is the transmission times of lead code, and powerRampingStep is the power increment factor of high-rise configuration.
3. method according to claim 2, it is characterised in that
When sending the PRACH on auxiliary component cell SCell, PREAMBLE_RECEIVED_TARGET_POWER is principal component
The target received power of the lead code received on cell PCell；PreambleInitialReceivedTargetPower is
The preamble initial target receiving powers of high-rise configuration on the PCell；DELTA_PREAMBLE is described on the PCell
The power bias amount based on preamble forms of high level configuration；PREAMBLE_TRANSMISSION_COUNTER is described
The transmission times of the upper lead codes of PCell；PowerRampingStep be the high-rise configuration on the PCell power increment because
Son.
4. according to the method described in claim 1, it is characterised in that the PLcDetermined by below equation：
PLc=referenceSignalPower-higher layer filtered RSRP, wherein,
ReferenceSignalPower is UE by measuring the obtained actual receiving powers of reference measure signal CRS, higher
Layer filtered RSRP are the high-rise filtered reference signal power of process that the UE is received.
5. method according to any one of claim 1 to 4, it is characterised in that obtaining offset includes：
The offset is obtained by physical layer signaling or signaling for high-rise configuration.
6. a kind of determining device of Physical Random Access Channel PRACH transmission power, it is characterised in that including：
Acquisition module, for obtaining RACH power bias offset；
Determining module, the transmission power for determining PRACH using the offset；
Wherein, the determining module is used to determine the transmission power PPRACH using equation below：
PPRACH=min { PCMAX,c(i),PREAMBLE_RECEIVED_TARGET_POWER+PLc+offset}；
Wherein, PCMAX,c(i) be the user equipment (UE) allowed on subframe i on current carrier maximum transmission power, PLcIt is current
The path loss that UE measurements are obtained on carrier wave, PREAMBLE_RECEIVED_TARGET_POWER is that evolved base station eNB is received
Lead code target received power.
7. device according to claim 6, it is characterised in that the PREAMBLE_RECEIVED_TARGET_POWER leads to
Cross below equation determination：
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_
PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER -1) * powerRampingStep, wherein,
PreambleInitialReceivedTargetPower is the lead code initial target receiving power of high-rise configuration, DELTA_
PREAMBLE is the power bias amount based on lead code form of the high-rise configuration, PREAMBLE_TRANSMISSION_
COUNTER is the transmission times of lead code, and powerRampingStep is the power increment factor of high-rise configuration.
8. device according to claim 7, it is characterised in that
When sending the PRACH on auxiliary component cell SCell, PREAMBLE_RECEIVED_TARGET_POWER is principal component
The target received power of the lead code received on cell PCell；PreambleInitialReceivedTargetPower is
The preamble initial target receiving powers of high-rise configuration on the PCell；DELTA_PREAMBLE is described on the PCell
The power bias amount based on preamble forms of high level configuration；PREAMBLE_TRANSMISSION_COUNTER is described
The transmission times of the upper lead codes of PCell；PowerRampingStep be the high-rise configuration on the PCell power increment because
Son.
9. device according to claim 6, it is characterised in that the PLcDetermined by below equation：
PLc=referenceSignalPower-higher layer filtered RSRP, wherein,
ReferenceSignalPower is UE by measuring the obtained actual receiving powers of reference measure signal CRS, higher
Layer filtered RSRP are the high-rise filtered reference signal power of process that the UE is received.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441806.0A CN103179654B (en) | 2011-12-26 | 2011-12-26 | PRACH determining method of launch power and device |
| PCT/CN2012/080480 WO2013097473A1 (en) | 2011-12-26 | 2012-08-22 | Method and device for determining transmitting power of prach |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110441806.0A CN103179654B (en) | 2011-12-26 | 2011-12-26 | PRACH determining method of launch power and device |
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| CN103179654B true CN103179654B (en) | 2017-07-18 |
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| EP3413642B1 (en) * | 2014-01-28 | 2021-06-16 | Huawei Technologies Co., Ltd. | Method for determining transmit power in coverage enhancement scenario and device |
| CN107006037A (en) * | 2014-10-03 | 2017-08-01 | 瑞典爱立信有限公司 | Physical Random Access Channel transmission is handled in multicarrier scene |
| WO2017183309A1 (en) * | 2016-04-20 | 2017-10-26 | シャープ株式会社 | Terminal device, base station device and communication method |
| CN108270532B (en) * | 2016-12-30 | 2021-05-18 | 华为技术有限公司 | Information transmission method, access network equipment and terminal |
| CN107155206A (en) * | 2017-05-18 | 2017-09-12 | 南京佰联信息技术有限公司 | A kind of cut-in method and base station |
| CN108934064B (en) * | 2017-05-22 | 2022-02-01 | 中国移动通信有限公司研究院 | Random access method and device, communication equipment and storage medium |
| CN108990139B (en) * | 2017-06-02 | 2021-01-12 | 维沃移动通信有限公司 | Transmission power calculation method, related equipment and system |
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| CN103179654A (en) | 2013-06-26 |
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