CN102984793B - Preamble received target power configuration method, device and base station - Google Patents
Preamble received target power configuration method, device and base station Download PDFInfo
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- CN102984793B CN102984793B CN201210497416.XA CN201210497416A CN102984793B CN 102984793 B CN102984793 B CN 102984793B CN 201210497416 A CN201210497416 A CN 201210497416A CN 102984793 B CN102984793 B CN 102984793B
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Abstract
The invention provides a preamble received target power configuration method which comprises the following steps: S21, obtaining the IOT (Interference over Thermal) of an upstream subframe in a PRACH (Physical Random Access Channel) from a physical layer; S22, obtaining the static configuration preamble received target power; and S23, calculating the preamble received target power value used for reconfiguration according to the static configuration preamble received target power and the IOT value of the upstream subframe. According to the invention, the preamble received target power of a UE (user equipment) is dynamically adjusted based on the IOT during the reconfiguration process, so that the preamble received target power is reasonable to further inhibit the influence of the upstream interference on the preamble; and therefore, the preamble can be quickly and successfully detected by an eNB (evolved Node B), the success ratio of reconfiguration is improved, and the reconfiguration delay is reduced.
Description
Technical field
The invention belongs to mobile communication technology field, particularly relate to a kind of leading expectation received power collocation method, device and base station.
Background technology
LTE(Long Term Evolution, Long Term Evolution) cell merge space interface signaling flow process as shown in Figure 1, no matter based on S1 interface or X2 interface, the switching flow on eating dishes without rice or wine is identical.
In handoff procedure, as UE(User Equipment, user terminal) when receiving switching command RRCConnectionReconfiguration and start to switch to Target cell, first must complete random access procedure in Target cell, then could successful switch to Target cell.Random access procedure comprises random access procedure based on competition and non-competing random access procedure, and the two difference is that whether base station is in advance to leading (Preamble) code index that UE configuration is fixing.But no matter which kind of random access procedure, all requires that base station can at PRACH(Physical RandomAccess Channel, Physical Random Access Channel) on correctly receive and Preamble code detected.
PRACH channel adopts open Loop Power control, base station configures the expectation received power PREAMBLE_RECEIVED_TARGET_POWER of Preamble, when during switching, this parameter configuration can be carried out Stochastic accessing to UE, UE by switching command RRCConnectionReconfiguration by base station, the Preamble power of transmission is calculated as follows:
P
PRACH=min{P
CMAX，PREAMBLE_RECEIVED_TARGET_POWER+PL}_[dBm]，
Wherein, P
pRACHrepresent that PRACH channel sends the performance number of Preamble, unit is dBm; P
cMAXbe the UE maximum transmission power of configuration, unit is dBm; PL is the circuit loss value that UE measurement obtains, and unit is dB.
After UE sends Preamble, if this random access procedure failure, UE meeting separated in time initiating random access procedure again, the Preamble retransmitted will increase power than the last time by a certain step-length (step), until Stochastic accessing success or Preamble send reach maximum number of times of transmission.
In prior art solutions, the expectation received power PREAMBLERECEIVED_TARGET_POWER of Preamble is cell-level parameter, during switching no matter the interference level of community how, fixing maintain configuration value is all pressed by this parameter configuration to UE in base station, that is:
PREAMBLE_RECEIVED_TARGET_POWER＝raPreambleInitRcvTargetPow，
Wherein, raPreambleInitRcvTargetPow is static programming and configuration when wireless parameter is planned, then UE utilizes the transmitting power of this exploitation Preamble, initiating random access procedure.
Existing scheme does not consider the uplink interference level (IOT of Stochastic accessing Target cell, Interference over Thermal), UE calculates Preamble transmitted power according to the Preamble expectation received power of configuration and sends, due to the existence of uplink interference, eNB(evolved Node B may be caused, evolved base station) lower in the signal to noise ratio of Prach Channel Detection, thus because eNB possibly successfully cannot detect that Preamble code causes handoff failure in UE handoff procedure, even if or retransmit final handover success through repeatedly Preamble, but cause handover delay to increase, affect service-aware, and may be larger due to random access procedure time delay, cause the failure of follow-up flow process, thus handoff failure, and then cause handover success rate index to reduce.
Summary of the invention
(1) technical problem that will solve
Based on above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention is in handoff procedure, how to suppress uplink interference on the impact of Preamble, to promote handover success rate, reduces handover delay.
(2) technical scheme
In order to solve the problem, the invention provides a kind of leading Preamble expectation received power collocation method, comprising step: S21, obtain the uplink interference level IOT of Physical Random Access Channel PRACH place sub-frame of uplink from physical layer; The Preamble expectation received power of S22, acquisition static configuration; S23, calculate the Preamble expectation received power value for switching according to the IOT value of the Preamble expectation received power of described static configuration and described sub-frame of uplink.
Preferably, the described Preamble expectation received power value for switching is calculated in the following manner: PREAMBLE_RECEIVED_TARGET_POWER=raPreambleInitRcv TargetPow+k × IOT in step S23, wherein, PREAMBLE_RECEIVED_TARGET_POWER is described Preamble expectation received power value, raPreambleInitRcvTargetPow is the Preamble expectation received power of described static configuration, k is coefficient, and k > 0.
Preferably, k=1.
Preferably, before described step S21, also step is comprised: handover request is initiated to Target cell in S20, cell-of-origin; Also step is comprised: described Preamble expectation received power value is sent to described cell-of-origin by S24, described Target cell after described step S23; Described Preamble expectation received power value configures to be switched UE by S25, described cell-of-origin.
Preferably, obtain IOT in step S21 and carry out in the following manner: judge that can the IOT value of the described sub-frame of uplink in the current statistic cycle obtain: if can obtain, then select the IOT value of the sub-frame of uplink in the described current statistic cycle for calculating; Otherwise, select the IOT value of the described sub-frame of uplink in a nearest measurement period for calculating.
Present invention also offers a kind of leading Preamble expectation received power inking device, comprising: IOT acquiring unit, for obtaining the uplink interference level IOT of physical accidental access PRACH channel place sub-frame of uplink from physical layer; Static Preamble expectation received power acquiring unit, for obtaining the Preamble expectation received power of static configuration; Preamble expectation received power computing unit, for calculating the Preamble expectation received power value for switching according to the Preamble expectation received power from the static configuration of described static Preamble expectation received power acquiring unit and the IOT value from the sub-frame of uplink of described IOT acquiring unit.
Present invention also offers a kind of base station, it comprises above-mentioned arbitrary leading expectation Preamble received power inking device.
(3) beneficial effect
Preamble expectation received power collocation method provided by the invention, device and base station, by considering the IOT of Target cell in hand-off execution process, and based on the Preamble expectation received power of IOT dynamic conditioning UE, thus make Preamble expectation received power arrange rationally, and then suppress uplink interference on the impact of Preamble, thus ensure that Preamble can be detected successfully by eNB fast, improve handover success rate, reduce handover delay.
Accompanying drawing explanation
With reference to the accompanying drawings and further describe the present invention in conjunction with example.Wherein:
Fig. 1 is LTE cell merge space interface signaling schematic flow sheet in prior art;
The Preamble expectation received power collocation method schematic flow sheet of Fig. 2 for providing according to the embodiment of the present invention;
The Preamble expectation received power inking device structural representation of Fig. 3 for providing according to the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
In order to solve in handoff procedure because the existence of up co-channel interference causes base station correctly to receive or correctly cannot receive the problem of Preamble fast, the embodiment of the present invention proposes a kind of for the collocation method of UE to be switched in LTE system at the Preamble expectation received power PREAMBLE_RECEIVED_TARGET_POWER of Target cell, it is by configuring independently based on the Preamble expectation received power of IOT switching UE individual character, instead of all UE adopt identical static Preamble expectation received power configuration, improve handover success rate, reduce handover delay.
As shown in Figure 2, the handoff procedure Preamble expectation received power collocation method based on IOT that the embodiment of the present invention provides comprises the following steps:
Handover request is initiated to Target cell in S20, cell-of-origin;
Wherein, cell-of-origin can send handover request order by S1 or X2 interface to Target cell according to actual needs;
The RRM of S21, Target cell obtains the IOT of PRACH channel place sub-frame of uplink from physical layer;
Wherein, obtain IOT to carry out in the following manner: first judge that can the IOT value of this sub-frame of uplink in the current statistic cycle obtain, if can obtain, the IOT value of this sub-frame of uplink in the current statistic cycle is then selected to be used for calculating, otherwise, select the IOT value of this sub-frame of uplink in a nearest measurement period for calculating;
The RRM of S22, Target cell obtains the Preamble expectation received power raPreambleInitRcvTargetPow of static configuration;
This parameter is cell-level, is the OM(OperationMaintenance when wireless parameter is planned, Operation and Maintenance) static programming and configuration, the RRM of Target cell obtains by the mode of queries configuration database;
The RRM of S23, Target cell calculates according to the IOT value of the Preamble expectation received power raPreambleInitRcvTargetPow of static configuration and sub-frame of uplink the Preamble expectation received power value being used for this handoff procedure;
Particularly, the Preamble expectation received power value PREAMBLE_RECEIVED_TARGET_POWER for this handoff procedure can be calculated in the following manner:
PREAMBLE_RECEIVED_TARGET_POWER=raPreambleInitRcvTargetPow+k×IOT，
Wherein, k is coefficient, and k > 0; Preferably, k=1.
The Preamble expectation received power value PREAMBLE_RECEIVED_TARGET_POWER of this handoff procedure is sent to cell-of-origin by S24, Target cell;
Wherein, S1 interface message, X2 interface message or eNB inside story can be passed through according to actual needs to Target cell transmission Preamble expectation received power value in cell-of-origin;
S25, cell-of-origin are configured to be switched UE by the Preamble expectation received power value PREAMBLE_RECEIVED_TARGET_POWER of switching command by this handoff procedure.
More than calculating and layoutprocedure are independently for each switching UE, different to be switched UE and different moment, can according to different IOT values, obtain different PREAMBLE_RECEIVED_TARGET_POWER, thus the individual character configuration reached switching UE, reduce the impact that uplink interference receives Preamble.
As shown in Figure 3, the embodiment of the present invention is also corresponding provides a kind of handoff procedure Preamble expectation received power inking device based on IOT, comprise: IOT acquiring unit 31, static Preamble expectation received power acquiring unit 32 and Preamble expectation received power computing unit 33, wherein:
IOT acquiring unit 31, for obtaining the IOT of PRACH channel place sub-frame of uplink from physical layer;
Wherein, obtain IOT to carry out in the following manner: first judge that can the IOT value of this sub-frame of uplink in the current statistic cycle obtain, if can obtain, the IOT value of this sub-frame of uplink in the current statistic cycle is then selected to be used for calculating, otherwise, select the IOT value of this sub-frame of uplink in a nearest measurement period for calculating;
Static Preamble expectation received power acquiring unit 32, for obtaining the Preamble expectation received power raPreambleInitRcvTarget Pow of static configuration;
This parameter is cell-level, OM static programming and configuration when wireless parameter is planned, the mode by queries configuration database obtains;
Preamble expectation received power computing unit 33, for calculating according to the Preamble expectation received power raPreambleInitRcvTarget Pow from the static configuration of static Preamble expectation received power acquiring unit 32 and the IOT value from the sub-frame of uplink of IOT acquiring unit 31 the Preamble expectation received power value being used for this handoff procedure;
Particularly, the Preamble expectation received power value for this handoff procedure can be calculated in the following manner:
PREAMBLE_RECEIVED_TARGET_POWER=raPreambleInitRcvTargetPow+k×IOT，
Wherein, k is coefficient, and k > 0; Preferably, k=1.
In addition, the embodiment of the present invention also provides a kind of base station, and this base station comprises the above-mentioned handoff procedure Preamble expectation received power inking device based on IOT.
Known based on the description in above-described embodiment, according to the present invention, owing to considering the IOT of Target cell in handoff procedure, and calculate for the Preamble expectation received power in UE handoff procedure based on IOT, inhibit the impact that uplink interference receives Preamble, thus ensure that Preamble can be detected successfully by eNB fast, and then improve handover success rate, reduce handover delay.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a leading Preamble expectation received power collocation method, is characterized in that, comprise step:
S21, obtain the uplink interference level IOT of Physical Random Access Channel PRACH place sub-frame of uplink from physical layer;
The Preamble expectation received power of S22, acquisition static configuration;
S23, calculate the Preamble expectation received power value for switching according to the IOT value of the Preamble expectation received power of described static configuration and described sub-frame of uplink;
The described Preamble expectation received power value for switching is calculated in the following manner in step S23:
PREAMBLE_RECEIVED_TARGET_POWER＝raPreambleInitRcvTargetPow+k×IOT，
Wherein, PREAMBLE_RECEIVED_TARGET_POWER is described Preamble expectation received power value, and raPreambleInitRcvTargetPow is the Preamble expectation received power of described static configuration, and k is coefficient, and k > 0.
2. the method for claim 1, is characterized in that:
k＝1。
3., as the method as described in arbitrary in claim 1 ~ 2, it is characterized in that:
Also step was comprised before described step S21:
Handover request is initiated to Target cell in S20, cell-of-origin;
Also step is comprised after described step S23:
Described Preamble expectation received power value is sent to described cell-of-origin by S24, described Target cell;
Described Preamble expectation received power value configures to be switched UE by S25, described cell-of-origin.
4., as the method as described in arbitrary in claim 1 ~ 2, it is characterized in that, obtain IOT in step S21 and carry out in the following manner:
Judge that can the IOT value of the described sub-frame of uplink in the current statistic cycle obtain: if can obtain, then select the IOT value of the sub-frame of uplink in the described current statistic cycle for calculating; Otherwise, select the IOT value of the described sub-frame of uplink in a nearest measurement period for calculating.
5. method as claimed in claim 4, is characterized in that:
Also step was comprised before described step S21:
Handover request is initiated to Target cell in S20, cell-of-origin;
Also step is comprised after described step S23:
Described Preamble expectation received power value is sent to described cell-of-origin by S24, described Target cell;
Described Preamble expectation received power value configures to be switched UE by S25, described cell-of-origin.
6. a leading Preamble expectation received power inking device, is characterized in that, comprising:
IOT acquiring unit (31), for obtaining the uplink interference level IOT of physical accidental access PRACH channel place sub-frame of uplink from physical layer;
Static Preamble expectation received power acquiring unit (32), for obtaining the Preamble expectation received power of static configuration;
Preamble expectation received power computing unit (33), for calculating the Preamble expectation received power value for switching according to the Preamble expectation received power from the static configuration of described static Preamble expectation received power acquiring unit (32) and the IOT value from the sub-frame of uplink of described IOT acquiring unit (31); The described Preamble expectation received power value for switching is calculated especially by with under type:
PREAMBLE_RECEIVED_TARGET_POWER＝raPreambleInitRcvTargetPow+k×IOT，
Wherein, PREAMBLE_RECEIVED_TARGET_POWER is described Preamble expectation received power value, and raPreambleInitRcvTargetPow is the Preamble expectation received power of described static configuration, and k is coefficient, and k > 0.
7. device as claimed in claim 6, is characterized in that:
k＝1。
8. as the device as described in arbitrary in claim 6 ~ 7, it is characterized in that, obtain IOT and carry out in the following manner:
Judge that can the IOT value of the described sub-frame of uplink in the current statistic cycle obtain: if can obtain, then select the IOT value of the sub-frame of uplink in the described current statistic cycle for calculating; Otherwise, select the IOT value of the described sub-frame of uplink in a nearest measurement period for calculating.
9. a base station, is characterized in that:
Described base station comprises arbitrary described leading expectation received power inking device in claim 6 ~ 8.
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| EP3451748B1 (en) | 2013-08-13 | 2021-04-14 | Huawei Technologies Co., Ltd. | Method for sending preamble sequence and user equipment |
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| CN101132203A (en) * | 2006-08-25 | 2008-02-27 | 大唐移动通信设备有限公司 | Control method for reinforcing power of uplink physical signal channel |
| CN102547952A (en) * | 2010-12-09 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for regulating initial transmitting power of random access channel (RACH) preamble |
| CN102577530A (en) * | 2009-10-05 | 2012-07-11 | 瑞典爱立信有限公司 | Methods and arrangements in a mobile telecommunication network |
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| CN101132203A (en) * | 2006-08-25 | 2008-02-27 | 大唐移动通信设备有限公司 | Control method for reinforcing power of uplink physical signal channel |
| CN102577530A (en) * | 2009-10-05 | 2012-07-11 | 瑞典爱立信有限公司 | Methods and arrangements in a mobile telecommunication network |
| CN102547952A (en) * | 2010-12-09 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for regulating initial transmitting power of random access channel (RACH) preamble |
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