CN101998586A - Method and device for searching PLMN (Public Land Mobile Network) of TD-LTE (Time Division-LongTerm Evolution) - Google Patents
Method and device for searching PLMN (Public Land Mobile Network) of TD-LTE (Time Division-LongTerm Evolution) Download PDFInfo
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- CN101998586A CN101998586A CN2009100564997A CN200910056499A CN101998586A CN 101998586 A CN101998586 A CN 101998586A CN 2009100564997 A CN2009100564997 A CN 2009100564997A CN 200910056499 A CN200910056499 A CN 200910056499A CN 101998586 A CN101998586 A CN 101998586A
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Abstract
The invention relates to a method and device for searching a PLMN (Public Land Mobile Network) of a TD-LTE (Time Division-Long Term Evolution), which can improve the search speed. The method comprises the following steps of: selecting an available frequency point from an LTE frequency range; acquiring synchronism information of each frequency point, blindly detecting a PDCCH (Physical Downlink Control Channel) comprising a system information-radio network temporary identification (SI-RNTI) in a largest control domain range to collect SIB1(System Information Block 1) information; then analyzing the SIB1 information to obtain a PLMN identification, and updating an available PLMN list; and after traversing all available frequency points, reporting the available PLMN list.
Description
Technical field
The present invention relates to Long Term Evolution (TD-LTE) scheme of TD-SCDMA, especially relate to PLMN searching method and the device of a kind of TD-LTE of being used for.
Background technology
In the terminal operating process, PLMN (Public Land Mobile Network, public land mobile network) search is the important function that must support, be that terminal is under the situation that does not have priori and information, network condition around the active searching, by resolving all PLMN signs (PLMN_Id), put out available PLMN tabulation (PLMN_List) and report of user in order so that realize the process that manual network is selected.Compare with traditional 2G/3G access technology, the important variation of TD-LTE is an adaptive-bandwidth, and the center frequency point that a feature of bringing thus is a neighbor cell can not be subjected to the constraint of bandwidth.In the TD-LTE agreement, the minimum interval of the center frequency point of two sub-districts is 100KHz, and frequency range often reaches 100MHz (such as 2300MHz～2400MHz), this just means that the center frequency point number that needs in the PLMN search procedure to screen is up to 1000.
In addition, because the tabulation of the target of the PLMN search current available PLMN sign that is search, and the informational needs of PLMN sign obtains from the system message SIB1 (SystemInformation Block 1, system information block 1) of the sub-district that can search; Again because TD-LTE is a TDD (TimeDivision Duplex, time division duplex) system, want to collect SIB1, it is synchronous at first to obtain the sub-district, then by receiving MIB (Main Information Block, Master Information Block) obtains frame number information, further calculate the SIB1 position again, could on the precalculated position, receive SIB1.As can be seen, receive SIB1 according to conventional method, be a complexity and time-consuming procedure, and in the PLMN search procedure terminal need to might exist the center frequency point of sub-district attempt to receive SIB1, this just makes whole PLMN search procedure often need the time of several minutes even tens minutes, the user almost is impatient at so for a long time and waits for, and can cause the quick consumption of battery electric quantity.
Analyze the defective that it exists below by describing present PLMN searching method.
The time-frequency structure of TD-LTE downlink synchronous signal as shown in Figure 1.As can be seen, the TD-LTE downlink synchronous signal has following characteristics:
Master sync signal PSS (Primary Synchronization Signal) and auxiliary synchronous signals SSS (Secondary Synchronization Signal) determine sub-district Id jointly;
Frequency domain position relative fixed: in 6 RB in center frequency point both sides (radio bearer) scope;
It is the cycle with 5ms that the position appears in time domain, fixed-site (PSS repetition period 5ms, the content of SSS on the 5ms of front and back is different, so the strict repetition period of SSS in fact is 10ms);
Constitute: Zadoff-Chu sequence and derived sequence thereof, correlation is strong;
The formation of synchronizing signal and distribution situation and system bandwidth are irrelevant.
Except synchronizing signal, the TD-LTE system on the identical frequency domain position, also has PBCH (Physical Broadcast Channel, Physical Broadcast Channel), i.e. mib information in each radio frames.
With reference to shown in Figure 2, the process of PLMN search is at present finished by following steps:
Step S10 is at interval with 100KHz, lists all possible center frequency point.LTE frequency range with 100MHz is an example, 1000 of possible center frequency point numbers.
Step S11 may do synchronous detecting by frequency to each, obtains the 10ms synchronizing information;
Step S12 receives mib information, and obtains PHICH configuration information and frame number;
Step S13, statistics PHICH (Physical Hybrid ARQ Indicator Channel, the automatic request retransmission indicating channel of physical mixed) information, calculate the appearance position of SIB1, on this subframe, receive PCFICH (Physical Control Format Indicator Channel successively, Physical Control Format Indicator Channel) and PDCCH (Physical downlink control channel, Physical Downlink Control Channel);
Step S14 is according to the resource distribution reception SIB1 message of PDCCH indication;
Step S15 resolves SIB1, reads PLMN sign wherein, upgrades available PLMN tabulation;
Step S16 judges whether that all frequencies all travel through, if not, select next frequency in step S17, repeat the process of S11-S15, the possible frequency up to finishing reports all available PLMN tabulations in S18 at last.
This searching method major defect is that PLMN is long search time, and the user is difficult to stand the wait to this process, and in addition, for a long time Data Receiving and processing also brings the great expense incurred of power consumption, is in particular in:
1. can not do differentiation with frequency, the possible frequency that needs to screen is up to more than 1000, and huge number of searches is multiplied search time;
2. each frequency repeats the synchronous searching process, brings serious search time and the waste on the power consumption.For real subdistrict frequency point, abandon existing synchronizing information and search for again, for the small signal arrival time difference in minizone, need continuously the above data of reception 10ms to do to detect and judge; And for the frequency that does not have signal, then need to experience the repeated detection failure just can get rid of, time that brings and power consumption expense may be bigger;
3. according to protocol description, each is obtained sub-district later frequency synchronously, will just can finish the reception of SIB1 according to the flow process of following complexity: PBCH reception → calculating SIB1 position → reception PHICH and PCFICH also determine PDCCH scope → reception PDCCH, detect SI-RNIT (SystemInformation-Radio Network Temporary Identity, system information-Radio Network Temporary Identifier) → reception SIB1.The TTI of PBCH (Transmission Time Interval wherein, Transmission Time Interval) is 40ms, therefore correct reception also confirms that frame number needs more than the 40ms, and the every 80ms of SIB1 occurs once, add the fault-tolerant number of times for the search failure, this process is consuming time often will be at the 100ms order of magnitude.
In view of the problem that present searching method exists, need searching a kind of rationally tactful efficiently, improve the PLMN search speed, improve user experience and power consumption.
Summary of the invention
Problem to be solved by this invention provides the PLMN searching method of a kind of TD-LTE of being used for, and this method can improve search speed under the prerequisite that guarantees PLMN Search Results correctness.
The present invention proposes the PLMN searcher of a kind of TD-LTE of being used in addition.
The present invention solves the problems of the technologies described above the PLMN searching method that the technical scheme that adopts is a kind of TD-LTE of being used for of proposition, may further comprise the steps:
A. select the available frequency in the LTE frequency range;
B. obtain the synchronizing information of a frequency;
C. to the frequency of step b, blind Detecting comprises the physical downlink control channel PDCCH of system information-Radio Network Temporary Identifier SI-RNTI in maximum control domain scope, to collect SIB1 information;
D. resolve SIB1 information to obtain the PLMN sign, upgrade available PLMN tabulation;
E. repeating step b to d is up to all available frequencies of traversal; And
F. report available PLMN tabulation.
In one embodiment of this invention, select the step of the available frequency in the LTE frequency range to comprise: to be at interval with the preset frequency, to list all possible frequency in the LTE frequency range.In a preferred embodiment, select the step of the available frequency in the LTE frequency range also to comprise: on each possible frequency, receiving 5ms data at least continuously in the 1.08MHz bandwidth range at least, calculating the intensity indication RSSI of its feature received signal; And N the available frequency that filters out the intensity indication RSSI 〉=τ of feature received signal, τ wherein, N is a preset parameters.
In one embodiment of this invention, the step that obtains the synchronizing information of a frequency comprises: carry out synchronous detecting, obtain synchronizing information.
In one embodiment of this invention, the step that obtains the synchronizing information of a frequency comprises: for first frequency, carry out synchronous detecting, obtain synchronizing information, and in the local maintenance synchronizing information; And for the frequency after first frequency, with the synchronizing information safeguarded as synchronizing information.
In one embodiment of this invention, blind Detecting comprises the physical downlink control channel PDCCH of system information-Radio Network Temporary Identifier SI-RNTI in maximum control domain scope, comprises with the step of collecting SIB1 information:
C1. on each possible descending sub frame frame head position, receive 1ms data at least continuously;
C2. determine the search volume of control domain maximum possible scope and PDCCH;
The c3.PDCCH blind Detecting if the decoding verification of PDCCH is correct, then detects its SI-RNTI;
If c4. do not detect system information-Radio Network Temporary Identifier SI-RNTI then return step c1; If detect the DCI of SI-RNTI indication, then enter step c5;
C5. according to DCI indexed resource information processing PDSCH information, if decoding failure then return step c1, otherwise resolution system information and enter step c6;
If c6. SI information conforms SIB1 then extract the PLMN sign, otherwise the frequency of failure adds 1; And
If c7. the frequency of failure is then returned c1 less than default thresholding, otherwise end is to the search of this frequency.
On the other hand, the present invention proposes the PLMN searcher of a kind of TD-LTE of being used for, comprising:
Be used for selecting the device of the available frequency of LTE frequency range;
Be used to obtain the device of the synchronizing information of frequency;
Be used for the physical downlink control channel PDCCH that in maximum control domain scope blind Detecting comprises system information-Radio Network Temporary Identifier SI-RNTI, to collect the device of SIB1 information;
Be used to resolve SIB1 information to obtain the PLMN sign, upgrade the device of available PLMN tabulation;
Judge whether to travel through the device of all available frequencies; And
Be used to report the device of available PLMN tabulation.
In an embodiment of the present invention, it is at interval with the preset frequency that the device of the available frequency of LTE frequency range is selected in above-mentioned being used for, and lists all possible frequency in the LTE frequency range.
In an embodiment of the present invention, it is above-mentioned that to be used for selecting the device of the available frequency of LTE frequency range be at each possible frequency, at least receiving 5ms data at least continuously in the 1.08MHz bandwidth range, calculate the intensity indication RSSI of its feature received signal, and the intensity that filters out the feature received signal is indicated N the available frequency of RSSI 〉=τ, τ wherein, N is a preset parameters.
In an embodiment of the present invention, the device that above-mentioned being used to obtains the synchronizing information of a frequency is to carry out synchronous detecting, obtains synchronizing information.
In an embodiment of the present invention, above-mentioned being used to obtains the device of synchronizing information of a frequency for first frequency, carries out synchronous detecting, obtain synchronizing information, and in the local maintenance synchronizing information, for the frequency after first frequency, with the synchronizing information safeguarded as synchronizing information.
Therefore, the present invention is on the basis of analyzing TD-LTE system descending synchronizing signal and physical signalling time-frequency distributions characteristics, a kind of searching method of PLMN fast and device are proposed, can be under the prerequisite that guarantees PLMN Search Results correctness, several times even tens of times of ground improve search speed, significantly improving user experience and power consumption of terminal, provide certain flexibility and can join parameter, also is the guarantee of PLMN Search Results integrality simultaneously.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the time-frequency structure figure of TD-LTE downlink synchronous signal.
Fig. 2 illustrates a kind of existing P LMN search routine figure.
Fig. 3 illustrates the quick PLMN search routine of first embodiment of the invention.
Fig. 4 illustrates the quick PLMN search routine of second embodiment of the invention.
Fig. 5 illustrates the quick PLMN search routine of third embodiment of the invention.
Embodiment
Embodiments of the invention relate to the quick PLMN searching method that is used for TD-LTE, one or more embodiment among these embodiment consider that on the one hand possible center frequency point huge in the LTE frequency range causes the increase of search time, frame structure according to TD-LTE, may calculate its RSSI (Received Signal Strength Indicator on the center frequency point at each, the indication of received signal intensity), and adopt the strategy of absolute threshold+TopN, the number of optional frequency is narrowed down to the scope that is not more than N (N is default positive integer).On the other hand, synchronous characteristics according to TD-LTE, the 10ms frame synchronization information that writes down and obtain in first sub-district of local maintenance according to receiving the data maintenance synchronizing information, is the synchronous searching time of first sub-district each frequency saving afterwards after successful reception after this.In addition, after synchronization gain, to each possible frequency, blind Detecting comprises SI-RNTI (SystemInformation-Radio Network Temporary Identity in the The whole control territory, system information-Radio Network Temporary Identifier) PDCCH (Physical downlink control channel, Physical Downlink Control Channel), search for and successfully then collect SIB1 (System Information Block 1, system information block 1), be confirmed to be after the SIB1 that comprises the PLMN sign, then finish the system message of this frequency is received.
A plurality of embodiment of the present invention is described below with reference to the accompanying drawings.
First embodiment
With reference to shown in Figure 3, the PLMN searching method that is used for TD-LTE of present embodiment may further comprise the steps:
Step S20 selects the available frequency in the LTE frequency range, in the present embodiment, is the possible frequency number M of institute in the statistics LTE frequency range, supposes that W is the LTE band bandwidth, and 100KHz is preset frequency interval, then M=W/100K.
Step S21, the synchronizing information of a frequency of acquisition; In the present embodiment, can may do synchronous detecting by frequency, obtain the 10ms synchronizing information each;
Step S22, after synchronizing information obtains, may there be PDCCH (Physical downlinkcontrol channel in terminal, Physical Downlink Control Channel) detects SI-RNTI in the maximum control domain scope, and according to DCI (the Downlink Control Information that resolves, Downlink Control Information) receive PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), decoding also confirms whether be SIB1;
Step S23 resolves SIB1 information to obtain the PLMN sign, obtain the PLMN sign of a sub-district after, if this PLMN sign is available and be the content that does not have in the PLMN tabulation, then this PLMN sign is added freelist, upgrades available PLMN and tabulates;
Step S24 judges whether to travel through all available frequencies, if not, returning behind the execution in step S26, repeating step S21-S23 is up to all available frequencies of traversal;
Step S25 reports available PLMN tabulation.
Wherein, the step S22 of direct search SIB1 can further may further comprise the steps:
A. on each possible descending sub frame frame head position, receive 1ms data at least continuously;
B. determine the search volume of control domain maximum possible scope and PDCCH.Though PHICH (PhysicalHybrid ARQ Indicator Channel, the automatic request retransmission indicating channel of physical mixed) and PCFICH (Physical Control Format Indicator Channel, Physical Control Format Indicator Channel) can cause the expansion of hunting zone, but do not handle because the PLMN search does not relate to a large amount of user data, additional algorithm complex can not influence terminal capabilities.This method can be brought significantly dwindling of search time simultaneously, and this is only the problem that the PLMN search is concerned about most.
The c.PDCCH blind Detecting if the decoding CRC check of PDCCH is correct, then detects its RNTI (Radio Network Temporary Identity, Radio Network Temporary Identifier);
If d. do not detect SI-RNTI then return step a; If detect the DCI of SI-RNTI indication, then enter step e;
E. according to DCI indexed resource information processing PDSCH information, if decoding failure then return a, otherwise resolve SI (system information) and enter f;
If f. SI (system information) meets SIB1, then extract the PLMN tabulation, otherwise the frequency of failure adds 1;
If g. the frequency of failure is then returned step a less than default thresholding, otherwise end is to the search of this frequency.
Traditional SIB1 receives and follows MIB detections → frame number affirmations → SIB position calculation → plurality of processes such as SIB reception, and owing to cycle of SIB1 is 80ms, and the MIB detection needs a TTI, i.e. 40ms at the soonest; And the SIB1 blind checking method that adopts present embodiment to propose can utilize going out now of each SIB1.On average meaning, it is original 1/3 that this process can shorten to the SIB1 receiving course of each frequency, i.e. 40ms.
Present embodiment can reduce search time exponentially, with the 100MHz frequency range is example, possible center frequency point number is 1000, if adopt existing P LMN searching method, then the minimum time of the PLMN_Id of each frequency search needs constitutes: 30ms (synchronous searching, 3 search failures are then withdrawed from)+40ms (MIB reception)+80ms (SIB1 reception), 150ms altogether, 1000 frequencies then need 150s, and this is for stand-by period beyond affordability of user Lai Shuoshi; And the method that adopts embodiment to propose, the average SIB1 time of reception of each frequency is 45ms, can reduce the time that present MIB reception and SIB1 receive required 120ms greatly.
Second embodiment
With reference to shown in Figure 4, to compare with first embodiment, present embodiment at first carries out the screening of available frequency, to reduce the frequency number that needs search.The PLMN searching method that is used for TD-LTE of present embodiment may further comprise the steps:
Step S30 and S31 select the available frequency in the LTE frequency range.In the present embodiment, at first be the possible frequency number M of institute in step S30 statistics LTE frequency range, suppose that W is the LTE band bandwidth, 100KHz is preset frequency interval, then M=W/100K.At step S31, calculate the feature RSSI of each frequency then, and adopt the Policy Filtering of absolute value+TopN can use frequency.
For rssi measurement, specifically, as can be seen, the every 5ms of PSS and SSS can appear at 72 subcarriers around the center frequency point, promptly in the scope of 1.08MHz from the time-frequency structure of synchronizing signal shown in Figure 1.In addition, because TD-LTE agreement regulation PBCH appears at (different OFDM Symbol) in the same frequency domain scope of synchronizing signal the cycle.Therefore in the 1.08MHz frequency domain scope of real TD-LTE center frequency point both sides, necessarily there is downlink data within the 5ms.
To any one possible center frequency point F
i, receiving 5ms data at least continuously in the 1.08MHz bandwidth range at least, it is as follows to define its feature RSSI:
Wherein, I
Ij, Q
IjBe respectively the i/q signal of last j the sampled point of center frequency point i, the frequency of data sampling is 1.08MHz.
To might frequency the power ordering of feature RSSI, obtain any one frequency F
iSequence number R
i, can gather P with frequency according to following principle construction:
F
i∈P，If?RSSI
i≥τ，and?R
i≤N (2)
Wherein τ and N are preset parameters, and the meaning of τ is the minimum signal strength of real TD-LTE center frequency point, and the meaning of N is the maximum that covers the number of cells of terminal position simultaneously.These two parameters can be by obtaining in the off-line simulation and the network planning, can do suitably loosely in actual use to condition, promptly reduces the absolute threshold of signal strength signal intensity and enlarge the frequency hunting zone.
Step S32, the synchronizing information of a frequency of acquisition in the present embodiment, can be done synchronous detecting to the available frequency after each screening, obtains the 10ms synchronizing information;
Step S33, after synchronizing information obtained, terminal detected SI-RNTI in may having the maximum control domain scope of PDCCH, and according to the DCI message pick-up PDSCH that resolves, decoding also confirms whether be SIB1.
Step S34 resolves SIB1 information to obtain the PLMN sign, obtain the PLMN sign of a sub-district after, if this PLMN sign is available and be the content that does not have in the PLMN tabulation, then this PLMN sign is added freelist, upgrades available PLMN and tabulates;
Step S35 judges whether to travel through all frequencies, if not, returning behind the execution in step S37, repeating step S32-S34 is up to all available frequencies of traversal;
Step S36 reports available PLMN tabulation.
In above-mentioned step, the detailed process of the step S33 of direct search SIB1 please refer to first embodiment, is not described in detail at this.
Present embodiment can reduce search time significantly, with the 100MHz frequency range is example, possible center frequency point number is 1000, if adopt existing P LMN searching method, then the minimum time of the PLMN_Id of each frequency search needs constitutes: 30ms (synchronous searching, 3 search failures are then withdrawed from)+40ms (MIB reception)+80ms (SIB1 reception), 150ms altogether, 1000 frequencies then need 150s, and this is for stand-by period beyond affordability of user Lai Shuoshi; And the method that adopts embodiment to propose, first step rssi measurement needs 5 seconds (1000*5ms), may be reduced to below 100 by frequency simultaneously, and the synchronous searching time of each frequency is 30ms, average SIB1 time of reception is 45ms, so whole PLMN search needs the time to be not more than 5+100* (0.030+0.045)=12.5S, than having reduced more than ten times present search time.
The 3rd embodiment
With reference to shown in Figure 5, to compare with second embodiment, present embodiment has further adopted quick synchronous technology.The PLMN searching method that is used for TD-LTE of present embodiment may further comprise the steps:
Step S40 and S41 select the available frequency in the LTE frequency range.In the present embodiment, at first be the possible frequency number M of institute in step S40 statistics LTE frequency range, suppose that W is the LTE band bandwidth, 100KHz is preset frequency interval, then M=W/100K.At step S41, calculate the feature RSSI of each frequency then, and adopt the Policy Filtering of absolute value+TopN can use frequency.
For rssi measurement, specifically, to any one possible center frequency point F
i, receiving 5ms data at least continuously in the 1.08MHz bandwidth range at least, it is as follows to define its feature RSSI:
Wherein, I
Ij, Q
IjBe respectively the i/q signal of last j the sampled point of center frequency point i, the frequency of data sampling is 1.08MHz.
To might frequency the power ordering of feature RSSI, obtain any one frequency F
iSequence number R
i, can gather P with frequency according to following principle construction:
F
i∈P，If?RSSI
i≥τ，and?R
i≤N (2)
Wherein τ and N are preset parameters, and the meaning of τ is the minimum signal strength of real TD-LTE center frequency point, and the meaning of N is the maximum that covers the number of cells of terminal position simultaneously.These two parameters can be by obtaining in the off-line simulation and the network planning, can do suitably loosely in actual use to condition, promptly reduces the absolute threshold of signal strength signal intensity and enlarge the frequency hunting zone.
Obtain the synchronizing information of frequency at step S42-S44.Specifically, select first frequency, for first frequency, can judge at step S43 that not carry out the first time synchronous, thereby carry out synchronous detecting, obtain the 10ms synchronizing information at step S44 at step S42.Terminal can be in the local maintenance synchronizing information.Because TD-LTE is a synchronizing network, promptly the frame head of all sub-districts regularly is synchronous.Therefore other subdistrict frequency point after first frequency can utilize the synchronizing information of system maintenance to carry out synchronously, and receives data in view of the above, and this has just saved the above synchronous searching time of 10ms for each frequency.
Though because the relation of terminal location, the downstream signal incoming terminal of different districts has certain deviation, these problems can receive data and increase algorithm complex and solve by suitable increase.Increasing the lead that receives data, the promptly reception under some data conditions more, synchronized algorithm can be measured deviate come and correct mis-behave.Do not handle because the PLMN search does not relate to a large amount of user data, therefore the cost that increases here is an acceptable.
Step S45, after synchronizing information obtained, terminal detected SI-RNTI in may having the maximum control domain scope of PDCCH, and according to the DCI message pick-up PDSCH that resolves, decoding also confirms whether be SIB1.
Step S46 resolves SIB1 information to obtain the PLMN sign, obtain the PLMN sign of a sub-district after, if this PLMN sign is available and be the content that does not have in the PLMN tabulation, then this PLMN sign is added freelist, upgrades available PLMN and tabulates;
Step S47 judges whether to travel through all frequencies, if not, returning behind the execution in step S48, repeating step S43-S46 is up to all available frequencies of traversal;
Step S49 reports available PLMN tabulation.
In above-mentioned step, directly the detailed process of the step S45 of blind search SIB1 please refer to first embodiment, is not described in detail at this.
Present embodiment can reduce search time significantly, with the 100MHz frequency range is example, possible center frequency point number is 1000, if adopt existing P LMN searching method, then the minimum time that needs of the PLMN_Id of each frequency search constitutes: 30ms (synchronous searching, 3 search failures are then withdrawed from)+40ms (MIB reception)+80ms (SIB1 reception), 150ms altogether, 1000 frequencies then need 150s, and promptly 2.5 minutes, this was for stand-by period beyond affordability of user Lai Shuoshi; And the method that adopts embodiment to propose, first step rssi measurement needs 5 seconds (1000*5ms), may be reduced to below 100 by frequency simultaneously, and the average SIB1 time of reception of each frequency is 45ms, so whole PLMN search needs the time to be not more than 5+100*0.045=9.5S, promptly can finish the PLMN search within 10 seconds.
In addition, can be favourable with frequency although present embodiment adopts the Policy Filtering of absolute value+TopN in step S41, in another not shown embodiment, the step of the available frequency of this screening still can be omitted.
In sum, embodiments of the invention are at the long problem of PLMN search procedure, utilize the time-frequency distributions characteristics of the downlink synchronous signal of TD-LTE on the one hand, a kind of quick rssi measurement method whether center frequency point exists of weighing is proposed, and the strategy by absolute threshold and TopN, dwindle the hunting zone fast, and the flexible configuration of parameter τ, N provides certain flexibility; On the other hand, according to the network construction characteristic of TD-LTE, be that cost adapts to the difference of different districts on the time of advent with suitable raising algorithm complex, the time waste of avoiding the repetition synchronous searching to each sub-district to cause; Again on the one hand, adopt the method for blind Detecting to receive SIB1, improved the PLMN sign acquisition time of each frequency greatly each frequency.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (11)
1. PLMN searching method that is used for TD-LTE may further comprise the steps:
A. select the available frequency in the LTE frequency range;
B. obtain the synchronizing information of a frequency;
C. to the frequency of step b, blind Detecting comprises the physical downlink control channel PDCCH of system information-Radio Network Temporary Identifier SI-RNTI in maximum control domain scope, to collect SIB1 information;
D. resolve SIB1 information to obtain the PLMN sign, upgrade available PLMN tabulation;
E. repeating step b to d is up to all available frequencies of traversal; And
F. report available PLMN tabulation.
2. the PLMN searching method that is used for TD-LTE as claimed in claim 1 is characterized in that, selects the step of the available frequency in the LTE frequency range to comprise:
With the preset frequency is at interval, lists all possible frequency in the LTE frequency range.
3. the PLMN searching method that is used for TD-LTE as claimed in claim 2 is characterized in that, selects the step of the available frequency in the LTE frequency range also to comprise:
On each possible frequency, receiving 5ms data at least continuously in the 1.08MHz bandwidth range at least, calculate the intensity indication RSSI of its feature received signal; And
Filter out N the available frequency of the intensity indication RSSI 〉=τ of feature received signal, τ wherein, N is a preset parameters.
4. as each described PLMN searching method that is used for TD-LTE of claim 1-3, it is characterized in that the step that obtains the synchronizing information of a frequency comprises:
Carry out synchronous detecting, obtain synchronizing information.
5. as each described PLMN searching method that is used for TD-LTE of claim 1-3, it is characterized in that the step that obtains the synchronizing information of a frequency comprises:
For first frequency, carry out synchronous detecting, obtain synchronizing information, and in the local maintenance synchronizing information; And
For the frequency after first frequency, with the synchronizing information safeguarded as synchronizing information.
6. the PLMN searching method that is used for TD-LTE as claimed in claim 1, it is characterized in that, blind Detecting comprises the physical downlink control channel PDCCH of system information-Radio Network Temporary Identifier SI-RNTI in maximum control domain scope, comprises with the step of collecting SIB1 information:
C1. on each possible descending sub frame frame head position, receive 1ms data at least continuously;
C2. determine the search volume of control domain maximum possible scope and PDCCH;
The c3.PDCCH blind Detecting if the decoding verification of PDCCH is correct, then detects its SI-RNTI;
If c4. do not detect system information-Radio Network Temporary Identifier SI-RNTI then return step c1; If detect the DCI of SI-RNTI indication, then enter step c5;
C5. according to DCI indexed resource information processing PDSCH information, if decoding failure then return step c1, otherwise resolution system information and enter step c6;
If c6. SI information conforms SIB1 then extract the PLMN sign, otherwise the frequency of failure adds 1; And
If c7. the frequency of failure is then returned c1 less than default thresholding, otherwise end is to the search of this frequency.
7. PLMN searcher that is used for TD-LTE comprises:
Be used for selecting the device of the available frequency of LTE frequency range;
Be used to obtain the device of the synchronizing information of frequency;
Be used for the physical downlink control channel PDCCH that in maximum control domain scope blind Detecting comprises system information-Radio Network Temporary Identifier SI-RNTI, to collect the device of SIB1 information;
Be used to resolve SIB1 information to obtain the PLMN sign, upgrade the device of available PLMN tabulation;
Judge whether to travel through the device of all available frequencies; And
Be used to report the device of available PLMN tabulation.
8. the PLMN searcher that is used for TD-LTE as claimed in claim 7 is characterized in that, described to be used for selecting the device of the available frequency of LTE frequency range be at interval with the preset frequency, lists all possible frequency in the LTE frequency range.
9. the PLMN searcher that is used for TD-LTE as claimed in claim 8, it is characterized in that, it is described that to be used for selecting the device of the available frequency of LTE frequency range be at each possible frequency, at least receiving 5ms data at least continuously in the 1.08MHz bandwidth range, calculate the intensity indication RSSI of its feature received signal, and filter out N the available frequency of the intensity indication RSSI 〉=τ of feature received signal, and τ wherein, N is a preset parameters.
10. as each described PLMN searcher that is used for TD-LTE of claim 7-9, it is characterized in that the described device that is used to obtain the synchronizing information of a frequency is to carry out synchronous detecting, obtains synchronizing information.
11. as each described PLMN searcher that is used for TD-LTE of claim 7-9, it is characterized in that, the described device that is used to obtain the synchronizing information of a frequency carries out synchronous detecting to obtain synchronizing information for first frequency, and in the local maintenance synchronizing information, for the frequency after first frequency, with the synchronizing information safeguarded as synchronizing information.
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| CN 200910056499 CN101998586B (en) | 2009-08-17 | 2009-08-17 | Method and device for searching PLMN (Public Land Mobile Network) of TD-LTE (Time Division-LongTerm Evolution) |
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