CN103179654A - Method and device for determining emitting power of Physical Random Access Channel (PRACH) - Google Patents
Method and device for determining emitting power of Physical Random Access Channel (PRACH) Download PDFInfo
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- CN103179654A CN103179654A CN2011104418060A CN201110441806A CN103179654A CN 103179654 A CN103179654 A CN 103179654A CN 2011104418060 A CN2011104418060 A CN 2011104418060A CN 201110441806 A CN201110441806 A CN 201110441806A CN 103179654 A CN103179654 A CN 103179654A
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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
Abstract
The invention provides a method and a device for determining emitting power of a Physical Random Access Channel (PRACH). The method comprises steps of obtaining random access signal power offset; and determining the emitting power of the PRACH by using the offset. By the aid of the method, the emitting power of the PRACH is determined through the obtained offset, the problem of inaccurate emitting power determination of the PRACH of the prior art is solved, the accurate rate of the PRACH emitting power is improved and the system is optimized.
Description
Technical field
The present invention relates to the communications field, in particular to determining method of launch power and the device of a kind of PRACH.
Background technology
Long Term Evolution (Long Term Evolution, referred to as LTE) uplink physical channel of system comprises Physical Random 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 is referred to as PUCCH).Wherein the effect of PRACH channel is mainly to realize uplink synchronous and residential quarter switching.The up employing DFT-S-OFDMA of LTE (DFT-Spread OFDM, DFT expands OFDM) technology, reference signal and data are multiplexing together by the mode of time division multiplexing (Time Division Multiplex is referred to as TDM).Uplink reference signals 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 the Main Function of SRS is the measurement for up channel, being convenient to base station (referred to as eNB) and doing frequency selective scheduling, is a kind of " broadband " reference signal.
In the LTE system, because different subscriber equipment (User Equipment is referred to as UE) is different apart from the position of eNB, cause a plurality of UE signals to arrive time of eNB also not identical.Real system is take time of eNB as benchmark, just needs therefore to estimate that different UE arrives the time delay of base station, guarantees that the signal of different UEs is received by eNB at one time.The PRACH channel is measured different UEs to the time delay of base station by sending targeting sequencing (preamble), realizes uplink synchronous.In the process that switch the residential quarter, the PRACH channel is realized the quick switching of minizone by sending the synchronous target BS of targeting sequencing simultaneously.Random access procedure between user and residential quarter is divided into two kinds of competitive way and non-competing modes.Random access procedure based on competitive way need carry out hit-treatment, does not need based on the random access procedure of non-competing mode.
In order to satisfy (the International Telecommunication Union-Advanced of senior International Telecommunications Union, referred to as ITU-Advanced) requirement, senior Long Term Evolution (Long Term Evolution Advanced as the evolution standard of LTE, referred to as LTE-A) system (for example need to support larger system bandwidth, the highlyest can reach 100MHz), and need the existing standard of backward compatibility LTE.On the basis of existing LTE system, the bandwidth of LTE system can be merged to obtain larger bandwidth, this technology is called carrier aggregation (Carrier Aggregation, referred to as CA) technology, the availability of frequency spectrum, alleviation frequency spectrum resource that this technology can improve the IMT-Advance system are in short supply, and then optimize the utilization of frequency spectrum resource.
In the system that has introduced carrier aggregation, the carrier wave that carries out polymerization is called component carrier (Component Carrier is referred to as CC), also referred to as a residential quarter (Cell).Simultaneously, principal component carrier wave/residential quarter (Primary Component Carrier/Cell has also been proposed, referred to as PCC/PCell) and auxiliary component carrier/residential quarter (Secondary Component Carrier/Cell, referred to as SCC/SCell) concept, in the system that has carried out carrier aggregation, at least comprise a principal component carrier wave and auxiliary component carrier, wherein the principal component carrier wave is in state of activation always.
Introduced the concept of carrier aggregation due to the LTE-A system, the possibility that exists a plurality of up channels to send simultaneously, particularly under other cell have kept synchronous prerequisite, when UE carries out random access procedure on SCell, just need to send PRACH on SCell.
The computing formula of the up PRACH transmitting power in Rel-10 version LTE agreement 36.213 is:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c}。
Wherein, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave.
PL
cThe path loss that on current carrier wave, UE measures.
Wherein, PL
cAccount form be, UE obtains publicly-owned reference signal (the Common Reference Resource of high-rise configuration, referred to as CRS) after transmission power level referenceSignalPower, deduct with referenceSignalPower the high-rise filtered CRS received power of process that UE receives, the value that obtains is the path loss of UE.That is:
PL
c＝referenceSignalPower-higher?layer?filtered?RSRP。
Above-mentioned Reference Signal Received Power (Reference Signal Receiving Power is referred to as RSRP) is that UE is by the actual received power of the CRS that measures.
Above-mentioned higher layer filtered RSRP is the high-rise filtered reference signal power of process that above-mentioned UE receives.
Wherein, for up SCell, the actual received power of its CRS can be the actual received power of CRS on descending PCell, can be also to the actual received power of CRS on should the descending SCell of up SCell, by high-rise configuration parameter pathlossReferenceLinking indication.
PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, and its computing formula is as follows:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep。
Wherein preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration.
DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration.
PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble.
PowerRampingStep is the power increment factor of high-rise configuration.
At distributed multi-antenna system or cooperative multipoint transmission (Coordinate multi-point transmission, abbreviation CoMP) in system, because sending node and the receiving node of the uplink and downlink signals of UE end might be inconsistent, when the sending node of the uplink and downlink signals of UE end and receiving node when inconsistent, to cause the uplink receiving node of the PL value that estimates according to the reference signal that descending sending node sends and reality not larger to the PL value difference between UE, and because PRACH transmitting power formula need to calculate PL on current carrier wave
cTherefore, in the CoMP system, when the sending node of the uplink and downlink signals of UE end was inconsistent with receiving node, the transmitting power of PRACH was calculated inaccurate, causes PRACH access success rate to reduce, and then affects systematic function, reduction entire system throughput.
Do not define the PRACH transmitting power on SCell in existing Rel-10 version LTE standard 36.213, and because may there be larger difference in the channel circumstance of SCell and PCell, if therefore do not define the PRACH transmitting power on SCell, and the words that the PRACH power on SCell directly equates with PCell, PRACH transmitting power on SCell may not mated with the channel circumstance of SCell at this moment, can cause the PRACH access success rate on SCell to reduce, and then affect systematic function, reduce the entire system throughput.
Inaccurate problem for PRACH transmitting power in correlation technique is determined not yet proposes effective solution at present.
Summary of the invention
For the inaccurate problem that PRACH transmitting power in correlation technique is determined, the invention provides determining method of launch power and the device of a kind of PRACH, to address the above problem at least.
According to an aspect of the present invention, provide the determining method of launch power of a kind of PRACH, having comprised: obtained Random Access Channel power bias offset; Use described offset to determine the transmitting power of PRACH.
Preferably, use described offset to determine that the transmitting power of PRACH comprises: to use following formula to determine described transmitting power P
PRACH: P
PRACH=min{P
CMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PL
c+ offset};
Wherein, P
CMAX, c(i) be the maximum transmission power of the upper user equipment (UE) that allows of subframe i on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code of evolved base station eNB reception.
preferably, described PREAMBLE_RECEIVED_TARGET_POWER determines by following formula: PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the lead code initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the lead code form of described high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code, powerRampingStep is the power increment factor of high-rise configuration.
Preferably, when sending described PRACH on auxiliary component residential quarter SCell, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of described PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the above high-rise configuration of described PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of described PCell; PowerRampingStep is the power increment factor of the above high-rise configuration of described PCell.
Preferably, described PL
cDetermine by following formula:
PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that described UE receives.
Preferably, obtaining offset comprises: the signaling by physical layer signaling or high-rise configuration obtains described offset.
According to a further aspect in the invention, provide definite device of the transmitting power of a kind of PRACH, having comprised: acquisition module is used for obtaining Random Access Channel power bias offset; Determination module is used for using described offset to determine the transmitting power of PRACH.
Preferably, described determination module is used for using following formula to determine described transmitting power P
PRACH:
P
PRACH=min{P
CMAX, c(i), PREAMBLE_RECEIVED_TARGET_POWER+PL
c+ offset}; Wherein, P
CMAX, c(i) be the maximum transmission power of the upper user equipment (UE) that allows of subframe i on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code of evolved base station eNB reception.
preferably, described PREAMBLE_RECEIVED_TARGET_POWER determines by following formula: PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the lead code initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the lead code form of described high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code, powerRampingStep is the power increment factor of high-rise configuration.
Preferably, when sending described PRACH on auxiliary component residential quarter SCell, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of described PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the above high-rise configuration of described PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of described PCell; PowerRampingStep is the power increment factor of the above high-rise configuration of described PCell.
Preferably, described PL
cDetermine by following formula:
PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that described UE receives.
By the present invention, adopt the offset that gets to determine the transmitting power of PRACH, solve the inaccurate problem that in the correlation technique, the PRACH transmitting power is determined, and then reached the accuracy rate that improves the PRACH transmitting power, and the effect of optimization system performance.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the determining method of launch power of the PRACH of the embodiment of the present invention;
Fig. 2 is the structured flowchart according to definite device of the transmitting power of the PRACH of the embodiment of the present invention;
Fig. 3 is used for the flow chart of the PRACH transmitting power computational process on SCell according to the uplink random access channel power control method of the embodiment of the present invention;
Fig. 4 is used for the flow chart of the PRACH transmitting power computational process of CoMP system according to the uplink random of embodiment of the present invention access channel power control method; And
Fig. 5 is the schematic diagram according to the determining method of launch power application scenarios of the PRACH of the embodiment of the present invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
In distributed multi-antenna system or CoMP system, because sending node and the receiving node of the uplink and downlink signals of UE end might be inconsistent, when the sending node of the uplink and downlink signals of UE end and receiving node when inconsistent, to cause the uplink receiving node of the PL value that estimates according to the reference signal that descending sending node sends and reality not larger to the PL value difference between UE, cause the transmitting power of PRACH this moment to calculate inaccurate, cause PRACH access success rate to reduce, and then affect systematic function, reduce the entire system throughput.In the system of carrier aggregation, the PRACH transmitting power on SCell may not mated with the channel circumstance of SCell in addition, can cause the PRACH access success rate on SCell to reduce, and then affect systematic function, reduces the problem of entire system throughput.
Based on this, the present embodiment provides the determining method of launch power of a kind of PRACH, the method can be applied to LTE and LTE-A (Long Term Evolution Advanced, senior 3GPP Long Term Evolution) among, Fig. 1 is the flow chart according to the determining method of launch power of the PRACH of the embodiment of the present invention, as shown in Figure 1, the method comprises the steps S102 and step S104.
Step S102 obtains Random Access Channel power bias offset.
Step S104 uses offset to determine the transmitting power of PRACH.
Pass through above-mentioned steps, when determining the transmitting power of PRACH, offset takes in to the Random Access Channel power bias, make when the sending node of the uplink and downlink signals of UE end and receiving node when inconsistent, it is more accurate that the transmitting power of PRACH is calculated, PRACH transmitting power on SCell and the channel circumstance of SCell are complementary, thereby have improved the accuracy of the transmitting power of definite PRACH, optimize systematic function.
When implementing, when using offset to determine the transmitting power of PRACH, can adopt default formula to determine the transmitting power of PRACH, also can formula that determine at present the transmitting power of PRACH be improved, for example, use following formula to determine transmitting power P
PRACH:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}；
Wherein, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives of evolved base station eNB.The transmitting power of determining in this way PRACH is simple and practical.
As one preferred embodiment, above-mentioned PREAMBLE_RECEIVED_TARGET_POWER can determine by following formula:
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code preamble, powerRampingStep is the power increment factor of high-rise configuration.
preferably, in above-mentioned preferred implementation, when sending PRACH on auxiliary component residential quarter SCell, can use the parameter that is exclusively used in SCell to determine PREAMBLE_RECEIVED_TARGET_POWER, also can adopt the parameter in existing formula to determine, for example: when the PRACH power that the uplink random access channel power control method that provides when the present embodiment is used for the SCell of carrier aggregation system is controlled, above-mentioned configuration parameter: PREAMBLE_RECEIVED_TARGET_POWER, preambleInitialReceivedTargetPower, DELTA_PREAMBLE and PREAMBLE_TRANSMISSION_COUNTER, powerRampingStep and preambleTransMax can directly use the same parameter on PCell, also can control the PRACH control parameter that separate configurations is exclusively used in SCell accordingly for the PRACH transmitting power on SCell, for example, PREAMBLE_RECEIVED_TARGET_POWER_s, preambleInitialReceivedTargetPower_s, DELTA_PREAMBLE_s, PREAMBLE_TRANSMISSION_COUNTER_s and powerRampingStep_s and preambleTransMax_s.Determine that with the parameter in existing formula PREAMBLE_RECEIVED_TARGET_POWER saves time, workable.For example: PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the upper high-rise configuration of PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of PCell; PowerRampingStep is the power increment factor of the upper high-rise configuration of PCell.
Preferably, the PL in above preferred embodiment
cCan determine by following formula: PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that UE receives.
When implementing, the mode of obtaining Random Access Channel power bias offset has a variety of, as one preferred embodiment, provide the implementation of following easy operating in the present embodiment: pass through signaling UE by eNB, for example, the signaling by physical layer signaling or high-rise configuration obtains offset.Wherein, above-mentioned physical layer signaling is the physical layer signaling that is carried on descending carrier.
The up PRACH power determining method that the present embodiment provides is by the effect of offset, can adjust the PRACH transmitted power that is in the UE in distributed multi-antenna system or CoMP system, realized the accurate calculating of the transmitting power calculating of PRACH, improve the access success rate of the PRACH of UE, optimized the performance of system.
In addition, the up PRACH power determining method that the present embodiment provides is by the effect of offset, can also adjust the PRACH transmitting power on SCell, realize the coupling of the channel circumstance of PRACH transmitting power on SCell and SCell, improve the PRACH access success rate of SCell, improve systematic function.
In another embodiment, also provide definite software of the transmitting power of a kind of PRACH, this software be used for to be carried out the technical scheme that above-described embodiment and preferred embodiment are described.
In another embodiment, also provide a kind of storage medium, stored definite software of the transmitting power of above-mentioned PRACH in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
The embodiment of the present invention also provides definite device of the transmitting power of a kind of PRACH, definite device of the transmitting power of this PRACH can be used for realizing determining method of launch power and the preferred implementation of above-mentioned PRACH, carried out explanation, repeat no more, the module that relates in definite device of the below to the transmitting power of this PRACH describes.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described system and method for following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.
Fig. 2 is the structured flowchart according to definite device of the transmitting power of the PRACH of the embodiment of the present invention, and as shown in Figure 2, this device comprises: acquisition module 22 and determination module 24, the below is described in detail said structure.
Acquisition module 22 is used for obtaining Random Access Channel power bias offset; Determination module 24 is connected to acquisition module 22, determines the transmitting power of PRACH for the offset that uses acquisition module 22 to get.
The present embodiment passes through said apparatus, when using determination module 24 to determine the transmitting power of PRACH, the Random Access Channel power bias offset that acquisition module 22 is got takes in, make when the sending node of the uplink and downlink signals of UE end and receiving node when inconsistent, it is more accurate that the transmitting power of PRACH is calculated, PRACH transmitting power on SCell and the channel circumstance of SCell are complementary, thereby improved the accuracy of the transmitting power of definite PRACH, improved systematic function.
Above-mentioned determination module 24 is used for using following formula to determine transmitting power P
PRACH:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}；
Wherein, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives of evolved base station eNB.
Preferably, PREAMBLE_RECEIVED_TARGET_POWER determines by following formula:
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code, powerRampingStep is the power increment factor of high-rise configuration.
In addition, when sending PRACH on auxiliary component residential quarter SCell, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the upper high-rise configuration of PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of PCell; PowerRampingStep is the power increment factor of the upper high-rise configuration of PCell.
Preferably, PL
cCan determine by following formula:
PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that UE receives.
Describe below in conjunction with preferred embodiment, following preferred embodiment combines above-described embodiment and preferred implementation.
Preferred embodiment one:
The present embodiment provides the determining method of launch power of a kind of PRACH, is divided in the present embodiment two application scenarioss and is described respectively.Particularly:
the application scenarios 1 of the present embodiment is: in distributed multi-antenna system or CoMP system, because sending node and the receiving node of the uplink and downlink signals of UE end might be inconsistent, when the sending node of the uplink and downlink signals of UE end and receiving node when inconsistent, to cause the uplink receiving node of the PL value that estimates according to the reference signal that descending sending node sends and reality not larger to the PL value difference between UE, cause the transmitting power of PRACH this moment to calculate inaccurate, cause PRACH access success rate to reduce, and then affect systematic function, reduce the entire system throughput.
Fig. 3 is used for the flow chart of the PRACH transmitting power computational process on SCell according to the uplink random access channel power control method of the embodiment of the present invention, as shown in Figure 3, this flow chart comprises the steps that S302 is to step S308.
UE in step S302:CoMP system or distributing antenna system need to send PRACH.
Step S304:eNB notifies UE by signaling with Random Access Channel power bias offset.
Step S306:UE is provided by the PRACH transmitting power computing formula that provides in the present embodiment by the transmitting power of PRACH.
Step S308:UE sends PRACH according to the transmitting power of the PRACH that calculates.
in the present embodiment, be in UE under above-mentioned application scenarios 1 when sending PRACH, the uplink receiving node of the PL value that the reference signal that sends according to descending sending node due to UE in distributed multi-antenna system or CoMP system estimates and reality is not larger to the PL value difference between UE, the method that increases the Random Access Channel power bias in the power calculation of Random Access Channel that proposes by the present invention, the PRACH transmitted power that is in the UE in distributed multi-antenna system or CoMP system is adjusted, realized the accurate calculating that the transmitting power of the PRACH of UE is calculated, improve the success rate of PRACH, improve systematic function.
The application scenarios 2 of the present embodiment is: in the system of carrier aggregation, when needing on SCell to access at random, UE sends PRACH on SCell.Do not define the PRACH transmitting power on SCell in existing Rel-10 version LTE standard 36.213, and because may there be larger difference in the channel circumstance of SCell and PCell, if therefore do not define the PRACH transmitting power on SCell, and the words that the PRACH power on SCell directly equates with PCell, PRACH transmitting power on SCell may not mated with the channel circumstance of SCell at this moment, can cause the PRACH access success rate on SCell to reduce, and then affect systematic function, reduce the entire system throughput.
Fig. 4 is used for the flow chart of the PRACH transmitting power computational process of CoMP system according to the uplink random of embodiment of the present invention access channel power control method, as shown in Figure 4, this flow chart comprises the steps that S402 is to step S408.
Step S402:UE need to access on Scell at random, carries out the transmission of PRACH on Scell.
Step S404:eNB notifies UE by signaling with Random Access Channel power bias offset.
The PRACH transmitting power computing formula that step S406:UE provides by embodiment is calculated the transmitting power of the upper PRACH of Scell.
Step S408:UE sends PRACH according to the transmitting power of the PRACH on the Scell that calculates on Scell.
In the present embodiment, when being in UE under above-mentioned application scenarios 2 sending PRACH on SCell, possible PRACH transmitting power may with the unmatched situation of channel circumstance, the method that increases the Random Access Channel power bias in the power calculation of Random Access Channel that proposes by the present invention, UE can realize the coupling of the channel circumstance of PRACH transmitting power on SCell and SCell, improve the PRACH access success rate of SCell, improve systematic function.
Preferred embodiment two
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 1 of preferred embodiment one, Fig. 5 is the schematic diagram according to the determining method of launch power application scenarios of the PRACH of the embodiment of the present invention, as shown in Figure 5, two users are arranged in a Serving cell, be designated as respectively UE1 and UE2.Wherein, the downlink path loss of UE1 distance service residential quarter eNB is designated as DL PL_1, and the downlink path loss of UE2 distance service cell base station is designated as DL PL_2.Two nearest LPN of user of distance are designated as respectively LPN1, LPN2.LPN1 is designated as UL PL1 to the uplink pathloss of UE1, and LPN2 is designated as UL PL2 to the uplink pathloss of UE2.
In the present embodiment, in the scene shown in supposing, the up link node of UE1 is LPN1, and downlink node is service cell eNB, and the up link node of UE2 is LPN2, and downlink node is service cell eNB.
In scene shown in supposing, the path loss DL PL_1 of down link and DL PL_2 are much larger than path loss UL PL1 and the UL PL2 of the up channel of reality.
Preferably, suppose that UE need to send PRACH at this moment, with Random Access Channel power bias offset notice UE, UE can arrange the PRACH transmitting power to eNB according to the following equation by the physical layer signaling on descending carrier:
PPRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cThe path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, more excellent, can pass through following definite formula PREAMBLE_RECEIVED_TARGET_POWER:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep；
Wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble, and powerRampingStep is the power increment factor of high-rise configuration.
Preferred embodiment three
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 1 of preferred embodiment one, Fig. 5 is the schematic diagram according to the determining method of launch power application scenarios of the PRACH of the embodiment of the present invention, as shown in Figure 5, two users are arranged in a Serving cell, be designated as respectively UE1 and UE2.Wherein, the downlink path loss of UE1 distance service residential quarter eNB is designated as DL PL_1, and the downlink path loss of UE2 distance service cell base station is designated as DL PL_2.Two nearest LPN of user of distance are designated as respectively LPN1, LPN2.LPN1 is designated as UL PL1 to the uplink pathloss of UE1, and LPN2 is designated as UL PL2 to the uplink pathloss of UE2.
In scene shown in supposing, the up link node of UE1 is LPN1, and downlink node is service cell eNB, and the up link node of UE2 is LPN2, and downlink node is service cell eNB
In scene shown in supposing, the path loss DL PL_1 of down link and DL PL_2 are much larger than path loss UL PL1 and the UL PL2 of the up channel of reality.
In the present embodiment, suppose that UE need to send PRACH at this moment, with Random Access Channel power bias offset notice UE, UE arranges the PRACH transmitting power to eNB according to the following equation by high-level signaling:
PPRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, and more excellent, its computing formula is as follows:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep。
In above-mentioned formula, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble, and powerRampingStep is the power increment factor of high-rise configuration.
Preferred embodiment four
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 2 of preferred embodiment one, in the present embodiment, UE has configured two descending carriers, be designated as respectively DL CC1 and DL CC2, UE has also configured two up-link carriers, is designated as respectively UL CC1 and UL CC2, wherein UL CC1 is PCell, and UL CC2 is SCell.
Suppose this moment UL CC1 synchronously and activation, this moment, UE need to access on UL CC2 at random, UE carries out the PRACH transmission on UL CC2, this moment, eNB notified UE by the physical layer signaling on DL CC1 with Random Access Channel power bias offset, and UE arranges the PRACH transmitted power on UL CC2 according to the following equation:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, and more excellent, its computing formula is as follows:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble, and powerRampingStep is the power increment factor of high-rise configuration.
Preferred embodiment five
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 2 of preferred embodiment one, in the present embodiment, UE has configured two descending carriers, be designated as respectively DL CC1 and DL CC2, UE has also configured two up-link carriers, is designated as respectively UL CC1 and UL CC2, wherein UL CC1 is PCell, and ULCC2 is SCell.
Suppose this moment UL CC1 synchronously and activation, this moment, UE need to access on UL CC2 at random, UE carries out the PRACH transmission on UL CC2, this moment, eNB notified UE by high-level signaling with Random Access Channel power bias offset, and UE arranges the PRACH transmitted power on UL CC2 according to the following equation:
PPRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cThe path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, more excellent, can adopt following formula to determine REAMBLE_RECEIVED_TARGET_POWER:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble, and powerRampingStep is the power increment factor of high-rise configuration.
Preferred embodiment six
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 2 of preferred embodiment one, in the present embodiment, UE has configured two descending carriers, be designated as respectively DL CC1 and DL CC2, UE has also configured two up-link carriers, is designated as respectively UL CC1 and UL CC2, wherein UL CC1 is PCell, and ULCC2 is SCell.
Suppose this moment UL CC1 synchronously and activation, this moment, UE need to access on UL CC2 at random, UE carries out the PRACH transmission on UL CC2, this moment, eNB notified UE by the physical layer signaling on DL CC2 with Random Access Channel power bias offset, and UE arranges the PRACH transmitted power on UL CC2 according to the following equation:
PPRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cThe path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the preamble that receives of eNB termination, more excellent, can determine PREAMBLE_RECEIVED_TARGET_POWER by following formula:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER-1)*powerRampingStep
Wherein, preambleInitialReceivedTargetPower is the preamble initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the preamble form of high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of preamble, and powerRampingStep is the power increment factor of high-rise configuration.
Preferred embodiment seven
The present embodiment provides the determining method of launch power of a kind of PRACH, the application scenarios of definite method of the present embodiment is the application scenarios 2 of preferred embodiment one, in the present embodiment, UE has configured two descending carriers, be designated as respectively DL CC1 and DL CC2, UE has also configured two up-link carriers, is designated as respectively UL CC1 and UL CC2, wherein UL CC1 is PCell, and ULCC2 is SCell.
Suppose this moment UL CC1 synchronously and activation, this moment, UE need to access on UL CC2 at random, UE carries out the PRACH transmission on UL CC2, this moment, eNB notified UE by the physical layer signaling on DL CC1 with Random Access Channel power bias offset, and UE arranges the PRACH transmitted power on UL CC2 according to the following equation:
PPRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER_s+PL
c+offset}。
Wherein, offset is that UE passes through Random Access Channel power bias, P
CMAX, c(i) be the maximum transmission power that allows on current carrier wave, PL
cThe path loss that on current carrier wave, UE measures.
Wherein, PREAMBLE_RECEIVED_TARGET_POWER_s be the eNB termination receive aim at the target received power that PRACH transmitting power in SCell is controlled the preamble configure, more excellent, can determine PREAMBLE_RECEIVED_TARGET_POWER_s by following formula:
PREAMBLE_RECEIVED_TARGET_POWER_s＝preambleInitialReceivedTargetPower_s+DELTA_PREAMBLE_s+(PREAMBLE_TRANSMISSION_COUNTER_s-1)*powerRampingStep_s
wherein, preambleInitialReceivedTargetPower_s is that the PRACH transmitting power that aims in SCell of high-rise configuration is controlled the preamble initial target received power that configures, DELTA_PREAMBLE_s is that the PRACH transmitting power that aims in SCell of high-rise configuration is controlled the power bias amount based on the preamble form that configures, PREAMBLE_TRANSMISSION_COUNTER_s is the transmission times that PRACH transmitting power in SCell is controlled the preamble that configures that aims at of high-rise configuration, powerRampingStep_s is that the PRACH transmitting power that aims in SCell of high-rise configuration is controlled the power increment factor that configures.
Pass through above-described embodiment, determining method of launch power and the device of a kind of PRACH are provided, determine one or more up channels and signal to be sent by the type according to random access procedure, to guarantee effective access of the PRACH channel on SCell, guarantee simultaneously effective transmission of the upper a plurality of up channels of other cell and signal.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. the determining method of launch power of a Physical Random Access Channel PRACH is characterized in that comprising:
Obtain Random Access Channel power bias offset;
Use described offset to determine the transmitting power of PRACH.
2. method according to claim 1, is characterized in that, uses described offset to determine that the transmitting power of PRACH comprises:
Use following formula to determine described transmitting power P
PRACH:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}；
Wherein, P
CMAX, c(i) be the maximum transmission power of the upper user equipment (UE) that allows of subframe i on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code of evolved base station eNB reception.
3. method according to claim 2, is characterized in that, described PREAMBLE_RECEIVED_TARGET_POWER determines by following formula:
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the lead code initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the lead code form of described high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code, powerRampingStep is the power increment factor of high-rise configuration.
4. method according to claim 3, is characterized in that,
When sending described PRACH on auxiliary component residential quarter SCell, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of described PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the above high-rise configuration of described PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of described PCell; PowerRampingStep is the power increment factor of the above high-rise configuration of described PCell.
5. method according to claim 2, is characterized in that, described PL
cDetermine by following formula:
PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that described UE receives.
6. the described method of any one according to claim 1 to 5, is characterized in that, obtains offset and comprise:
Signaling by physical layer signaling or high-rise configuration obtains described offset.
7. definite device of the transmitting power of a Physical Random Access Channel PRACH is characterized in that comprising:
Acquisition module is used for obtaining Random Access Channel power bias offset;
Determination module is used for using described offset to determine the transmitting power of PRACH.
8. device according to claim 7, is characterized in that, described determination module is used for using following formula to determine described transmitting power P
PRACH:
P
PRACH＝min{P
CMAX，c(i)，PREAMBLE_RECEIVED_TARGET_POWER+PL
c+offset}；
Wherein, P
CMAX, c(i) be the maximum transmission power of the upper user equipment (UE) that allows of subframe i on current carrier wave, PL
cBe the path loss that on current carrier wave, UE measures, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code of evolved base station eNB reception.
9. device according to claim 8, is characterized in that, described PREAMBLE_RECEIVED_TARGET_POWER determines by following formula:
PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTa rgetPower+DELTA_PREAMBLE+ (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep, wherein, preambleInitialReceivedTargetPower is the lead code initial target received power of high-rise configuration, DELTA_PREAMBLE is the power bias amount based on the lead code form of described high-rise configuration, PREAMBLE_TRANSMISSION_COUNTER is the transmission times of lead code, powerRampingStep is the power increment factor of high-rise configuration.
10. device according to claim 9, is characterized in that,
When sending described PRACH on auxiliary component residential quarter SCell, PREAMBLE_RECEIVED_TARGET_POWER is the target received power of the lead code that receives on principal component residential quarter PCell; PreambleInitialReceivedTargetPower is the preamble initial target received power of the upper high-rise configuration of described PCell; DELTA_PREAMBLE is the power bias amount based on the preamble form of the above high-rise configuration of described PCell; PREAMBLE_TRANSMISSION_COUNTER is the transmission times of the upper lead code of described PCell; PowerRampingStep is the power increment factor of the above high-rise configuration of described PCell.
11. device according to claim 8 is characterized in that, described PL
cDetermine by following formula:
PL
c=referenceSignalPower-higher layer filtered RSRP, wherein, referenceSignalPower is the reference measure signal CRS actual received power of UE by measuring, and higher layer filtered RSRP is the high-rise filtered reference signal power of process that described UE receives.
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|---|---|---|---|
| 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 CN103179654B (en) | 2017-07-18 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103179654B (en) | 2017-07-18 |
| WO2013097473A1 (en) | 2013-07-04 |
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