CN101534525A - Inter-cell united frequency hopping method, uplink transmission method and resource borrowing method - Google Patents
Inter-cell united frequency hopping method, uplink transmission method and resource borrowing method Download PDFInfo
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Abstract
The invention provides an inter-cell united frequency hopping method, wherein a network allocates an initial frequency hopping sub band to each cell in a plurality of adjacent cells on a group of band which is used by marginal areas of the plurality of adjacent cells, and leads the initial frequency hopping sub band of each cell to be mutually orthometric; and based on the allocated initial frequency hopping sub band, one or more terminals in the cell margin implement frequency hopping according to a same frequency hopping pattern on the group of band which is used by the marginal areas of the plurality of adjacent cells. By adopting the inter-cell united frequency hopping, the method can ensure that the mobile terminals in the margin of adjacent areas do not interfere with each other, increase the speed of the mobile terminals in the cell margin, and simultaneously obtain the diversity gain of frequency hopping.
Description
Technical field
The present invention relates to wireless communication field, particularly, relate in inter-cell united frequency hopping method, ascending transmission method and the inter-cell united frequency hopping process borrowing method adjacent local resource.
Background technology
In the evolution of mobile radio system air interface of new generation, with OFDM (Orthogonal Frequency Division Multiplexing, abbreviate OFDM as) be the orthogonal transmission scheme on basis, because its superior anti-multipath performance and high frequency efficiency are subjected to extensive concern day by day.Orthogonal transmission scheme based on OFDM comprises OFDM (Orthogonal Frequency Division Multiple Access, abbreviate OFDMA as), (Single Carrier Frequency DivisionMultiple Access abbreviates as single-carrier frequency division multiple access, SC-FDMA), and SC-FDMA is divided into the centralized frequency division multiple access of carrier wave (Localized-FDMA, abbreviate L-FDMA as) and distribution of carriers formula frequency division multiple access (Distributed-FDMA, abbreviate D-FDMA as), these multiple access schemes all are to distinguish portable terminal by the distribution of frequency.
At 3GPP (3rd Generation Partnership Project, third generation partner program) 3G of Qi Donging (3rd Generation) Long Term Evolution (Long Term Evolution, abbreviate LTE as) discussion in, also adopt this type of multiple access transmission technology.In order to improve the availability of frequency spectrum, generally adopting the cell frequency multiplex factor is 1 station layout, and the frequency for communication frequency range of each sub-district is identical.Brought neighbor cell to use identical frequency resource block to produce the problem of disturbing so inevitably, system has been caused influence, especially the influence to the cell edge portable terminal is bigger, therefore, how to improve this problem of cell edge portable terminal peak rate and has obtained concern.
Frequency hopping (Frequency Hopping abbreviates FH as) is a kind of important interference randomization technology, and it can reduce bursty interference effectively, with interference whitening, thus the performance of raising system.Frequency hopping mainly obtains frequency diversity gain and cell interference diversity gain, can improve user's signal to noise ratio, improves user's speed.
In 3GPP, frequency hopping is by extensive discussions, such as (motion number: R1-062851) in the motion of submitting to 3GPP in October, 2006, the motion that name is called " E-UTRA ascending frequency-hopping: Frequency hopping for E-UTRA uplink " thinks that frequency hopping can bring gain, improves the speed of portable terminal; (motion number: R1-063082), name is called the motion of " E-UTRAN ascending frequency-hopping scheme evaluation: Evaluation of Frequency Hopping Schemes in E-UTRAN Uplink " and has assessed not frequency hopping, intra-TTI frequency hopping (frequency hopping in the TTI), inter-TTI frequency hopping (frequency hopping between TTI) and four kinds of schemes of intra-TTI/inter-TTI while frequency hopping in submitting to the motion of 3GPP in November, 2006; (motion number: R1-063249), name is called the motion of " up LFDMA frequency hopping: UL LFDMA with hopping " and has also assessed above-mentioned four kinds of schemes in submitting to the motion of 3GPP in November, 2006; (motion number: R1-074209), the semi-static switching of mirror image frequency hopping (mirror hopping) and subband hopping (sub-band hopping) is supported in the motion that name is called " the frequency hopping mode of PUSCH channel: Frequency hoppingmethod for PUSCH " in submitting to the motion of 3GPP in October, 2007; Simultaneously, be called in name in the motion (R1-074157) of " EUTRA ascending frequency-hopping pattern: Frequency Hopping Pattern for EUTRA Uplink ", support to adopt the frequency hopping pattern (hopping pattern) of cyclic shift; Be called in name in the motion (R1-074222) of " the Intra-TTI hopping scheme of PUSCH channel: The Intra-TTIfrequency hopping scheme in PUSCH ", support to adopt rational frequency hopping pattern frequency hopping; (motion number: R1-075086) in submitting to the motion of 3GPP in November, 2007, the motion that name is called " research direction of ascending frequency-hopping: Way forwardon UL Frequency Hopping " is concluded and have been summed up various hopping schemes at that time, frequency hopping is divided into mirror image frequency hopping, subband hopping and according to frequency hopping pattern frequency hopping (Pattern basedhopping) etc.In a word, frequency hopping is the feasible program that solves up peak rate at present.
But; above-mentioned intra-TTI frequency hopping mode mainly obtains frequency diversity gain by traveling through incoherent frequency; but but do not consider the Frequency Distribution situation of adjacent sub-district; and can the frequency band of frequency hopping be limited usually; can only be on a part of frequency frequency hopping; therefore the frequency hopping gain is little; and inter-TTI frequency hopping mode inhomogeneous by frequency hopping point conflict; obtain cell interference diversity gain; what emphasize is that different districts uses different frequency hopping patterns; make and disturb equalization that still, also there is interference eventually in it.
In addition, in No. 200510069421.0 patent application of title for " frequency duplex factor as one is the resource allocation methods in 1 the multicarrier system ", the frequency that the portable terminal that may cause big interference is used staggers in each minizone, to reduce the disturbing raising systematic function.Wherein, disclosed the technical scheme of coming frequency hopping according to the Costas sequence, but the inventor of present patent application finds in implementing process of the present invention, though adopt the Costas sequence hopping can guarantee less interference hits probability, still can not guarantee complete collisionless.
Summary of the invention
Consider the existing frequency hopping mode that exists in the correlation technique do not consider the Frequency Distribution situation of adjacent sub-district, can only be on component frequency frequency hopping cause the frequency hopping gain little, and still there is the problem of interference (collision) in the minizone and proposes the present invention, for this reason, the present invention aims to provide a kind of inter-cell united frequency hopping method, to overcome the problems referred to above one of at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of inter-cell united frequency hopping method, be used for the united frequency hopping of a plurality of adjacent minizones.
Inter-cell united frequency hopping method according to the embodiment of the invention comprises: network for the initial frequency hopping sub-band of each cell allocation in a plurality of adjacent sub-districts, makes that the initial frequency hopping sub-band of each adjacent sub-district is mutually orthogonal on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts; One or more terminals of cell edge are based on the initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping.
Preferably, for the operation of the initial frequency hopping sub-band of each cell allocation is specially: the multiplexer mode according to a plurality of adjacent sub-districts is divided into a plurality of subset of spectrum with entire spectrum, and wherein, subset of spectrum is unit with the frequency, and any two subset of spectrum quadrature all; Be respectively one of them subset of spectrum of each adjacent cell selecting as initial frequency hopping sub-band.
Preferably, each frequency hopping is all according to the frequency in the frequency hopping pattern renewal subset of spectrum.
Preferably, frequency hopping pattern is arranged so that the coherent communication frequency range of the difference on the frequency of twice frequency hopping greater than system.
Preferably, said method further comprises: but for the sub-band of frequency hopping sub-district, use sub-band to other adjacent sub-districts less than the frequency hopping demand of the terminal of its cell edge; Using under the case of successful, upgrade the subset of spectrum of sub-district correspondence, and one or more terminal is being carried out frequency hopping at the sub-band of using according to frequency hopping pattern; Using under the situation of failure, the part terminal of sub-district is not carried out data in current time slots and is sent.
Preferably, said method further comprises: but for the sub-band of the frequency hopping sub-district greater than the frequency hopping demand of the terminal of its cell edge, the subband allocation that will exceed the frequency hopping demand uses for the terminal of inside, sub-district.
Preferably, said method further comprises: for the terminal that switches to adjacent sub-district from former persistent district, the more subset of spectrum of new terminal correspondence.
According to a further aspect in the invention, provide a kind of ascending transmission method, it realizes the uplink of a plurality of adjacent minizones by inter-cell united frequency hopping is combined with up receive diversity.
Ascending transmission method according to the embodiment of the invention comprises following processing: network for the initial frequency hopping sub-band of each cell allocation in a plurality of adjacent sub-districts, makes that the initial frequency hopping sub-band of each sub-district is mutually orthogonal on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts; One or more terminals of cell edge are based on the initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping; The signal that sends with the mode receiving terminal of diversity reception between the radio node of the radio node of the Serving cell of terminal and the adjacent sub-district of Serving cell.
Wherein, the operation of the signal that sends with the mode receiving terminal of diversity reception between the radio node of the radio node of the Serving cell of terminal and the adjacent sub-district of Serving cell is specially: according to the signal of the frequency hopping pattern of terminal receiving terminal emission on the different radio node, and one of in the following manner carry out diversity and merge: the output of choosing a best radio node of signal to noise ratio from a plurality of radio node is as received signal; The signal of a plurality of radio node is carried out direct addition with identical branch gain, and the signal after the addition is as received signal; Control the merging branch gain of the signal of each radio node, make to merge branch gain and be directly proportional with the signal to noise ratio of the radio node branch road of Serving cell respectively, and then with signal plus as received signal.
Wherein, above-mentioned radio node is a remote radio unit (RRU) of distributed base station, and the signal that sends of the terminal that receives of different radio electrical nodes sends to same baseband processing unit and carries out diversity and merge.
According to a further aspect in the invention, provide in a kind of inter-cell united frequency hopping process borrowing method to adjacent local resource.
Comprise following processing according to the borrowing method to adjacent local resource in the inter-cell united frequency hopping process of the embodiment of the invention: this sub-district sends frequency to adjacent sub-district and uses indication information; This sub-district receives frequency from adjacent sub-district and uses License Info; This sub-district sends frequency to adjacent sub-district and uses confirmation, and upgrades the frequency hopping subclass of this sub-district; Adjacent sub-district receives frequency and uses confirmation, and upgrades the frequency hopping subclass of this sub-district.
By above-mentioned technical method provided by the invention, than prior art, realized following beneficial effect at least: (1) has considered the frequency resource allocation of adjacent sub-district, has guaranteed that resource allocation does not conflict between the edge mobile terminal of adjacent minizone, has avoided interference; (2) identical frequency hopping pattern frequency hopping in whole frequency band is used in adjacent sub-district, making the glitch-free while between the portable terminal of adjacent minizone, has guaranteed the frequency hopping gain, has further improved the speed of edge mobile terminal.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the inter-cell united frequency hopping method of the embodiment of the invention;
Fig. 2 is the base station distribution schematic diagram according to the inter-cell united frequency hopping method of the embodiment of the invention;
Fig. 3 is the frequency hopping sequential schematic diagram according to the inter-cell united frequency hopping method of the embodiment of the invention;
Fig. 4 temporarily transfers schematic diagram according to the frequency of the inter-cell united frequency hopping method of the embodiment of the invention;
Fig. 5 is the detailed process flow chart of method shown in Figure 1;
Fig. 6 is the flow chart according to the ascending transmission method of the embodiment of the invention.
Embodiment
As mentioned above, in the frequency hopping mode that adopts at present, do not consider the Frequency Distribution situation of adjacent sub-district, and can only be on component frequency frequency hopping, this causes the frequency hopping gain little, simultaneously, in the relevant technology of frequency hopping, still has presence of intercell interference.
Given this, the embodiment of the invention provides a kind of inter-cell united frequency hopping method, and it one of can address the above problem at least.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention, to those skilled in the art, be easy to the present invention is carried out various modifications.Under the situation that does not deviate from the spirit and scope of the present invention, the rule of this paper definition can be applicable to other embodiment and application.For the sake of clarity, there is not to describe in detail the details of technologic material known in the technical field that the present invention relates to, to avoid unnecessarily making the present invention unclear.
In the inter-cell united frequency hopping method that provides according to the embodiment of the invention, the cell edge portable terminal adopts the frequency hopping mode to send, receive data, and the edge mobile terminal between neighbor cell adopts same frequency hopping pattern frequency hopping in whole mobile communication frequency spectrum, simultaneously, at any time, the acquisition frequency value of the edge mobile terminal between neighbor cell and be whole mobile communication frequency spectrum, and mutually orthogonal.
Particularly, Fig. 1 shows the implementation procedure according to embodiment of the invention inter-cell united frequency hopping method, and as shown in Figure 1, usually, this method comprises following processing:
Step S102, network is the initial frequency hopping sub-band of each cell allocation in a plurality of adjacent sub-districts on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, make that the initial frequency hopping sub-band of each sub-district is mutually orthogonal, and the initial frequency hopping sub-band sum of each sub-district is a whole mobile communication frequency range (bandwidth);
Step S104, one or more portable terminals of cell edge are based on the initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of above-mentioned a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping.
Details in the above-mentioned processing is below described respectively.
Because the cell edge portable terminal only takies the part of whole cell mobile terminal, the Frequency Distribution of edge mobile terminal also only takies the part of whole mobile communication frequency spectrum, in step S102, at first, entire spectrum F is divided into a plurality of subset of spectrum (F according to the multiplexer mode of a plurality of adjacent sub-districts
1, F
2..., F
N, wherein, the number of N depends on the multiplexer mode of sub-district), wherein, subset of spectrum is a unit with minimum frequency allocation unit (frequency), and any two subset of spectrum quadrature all, that is, each subclass satisfies
, k ≠ n,
The cell edge portable terminal adopts the form of frequency hopping to send, receive data.For this reason, be respectively one of them subset of spectrum of each adjacent cell selecting and use to edge mobile terminal as initial frequency hopping sub-band, at this moment, the initial frequency hopping sub-band of each sub-district is quadrature all.
Because the frequency hopping Frequency point of the edge mobile terminal in each sub-district is along with frequency hopping pattern changes, the frequency hopping sub-band of each sub-district is also along with change accordingly.In follow-up time slot, every frequency hopping once, each sub-district corresponding frequency spectrum subclass all needs to upgrade wherein frequency according to frequency hopping pattern.Because an initial subset of spectrum quadrature and a shared frequency hopping pattern, therefore, follow-up subset of spectrum still keeps quadrature.
Below be that example is described said process with base station distribution schematic diagram shown in Figure 2.Orthohexagonal sub-district stack tiling shown in Fig. 2 can constitute whole mobile operation coverage, and a sub-district C1 is adjacent with sub-district C2, C3, C4, C5, C6 and C7 respectively.To the more sensitive cell edge region of interference ratio with different shadow representation.The range size of this shade is by the path loss thresholding decision of portable terminal to the base station, and this path loss can be known according to pilot measurement, and path loss thresholding size is controlled by system, can decide according to system load and inside, sub-district, edge mobile terminal ratio.If the path loss of portable terminal less than thresholding, then is in cell inner area, be called the inner portable terminal in sub-district; If greater than thresholding, then be in cell edge region, be called the cell edge portable terminal.If system load is less relatively or inner, edge mobile terminal smaller, then can reduce thresholding, allow more portable terminal be positioned at edge.Here, adopt three cell reuse patterns, that is, sub-district C2, C4 adopt identical frequency configuration with C6, and sub-district C3, C5 adopt identical frequency configuration with C7.Sub-district C1, C2 and C3 constitute a Minimal Multiplex Unit, respectively dividing frequency subclass F1, F2 and F3.
Based on above-mentioned environment, carry out the initial frequency hopping subband allocation of each cell edge portable terminal.Distribution can be consulted to finish by pre-assigned fixed mode or by inter base station communication, negotiation can be benchmark according to the bandwidth requirements of each cell edge portable terminal, more initial frequency hopping sub-band can be distributed in the sub-district that the sub-band demand is big, but require the initial frequency hopping sub-band of each neighbor cell non-intersect, and initial frequency hopping sub-band sum is whole mobile communication frequency range.
With Fig. 3 is example, supposes that whole frequency has 6 frequencies (minimum frequency allocation unit), initially is divided into three parts.At first initial frequency hopping time slot (first slot), there are two frequencies each sub-district, and the shade of three frequency ranges distributes consistent with the dash area of sub-district, is that the edge mobile terminal of base station C1 is shared as 1,2 frequencies, composition subclass F
13,4 frequencies are that base station C2 edge mobile terminal is shared, form subclass F
25,6 frequencies are that the edge mobile terminal of base station C3 is shared, form subclass F
3Wherein base station C4 and C6 are consistent with the Frequency Distribution of base station C2, and the Frequency Distribution of base station C5 and C7 and base station C3 is consistent.
(2) step S104
In this step, the edge mobile terminal of all different districts is deferred to and is distributed the frequency of coming among the step S102, according to identical frequency hopping pattern frequency hopping, shown in the frequency after the frequency hopping of second time slot among Fig. 3 (second slot) and the 3rd time slot (third slot) distributes.
Here, frequency hopping pattern can be at random, but will guarantee as far as possible that frequency before frequency after the frequency hopping and the frequency hopping not in the related communication frequency range of system, that is, guarantees the coherent communication frequency range of the difference on the frequency of twice frequency hopping greater than system, thereby guarantees frequency diversity gain.Because frequency hopping pattern is identical, the collision as long as frequency hopping point does not conflict, then the Frequency point of following hopping can not conflict yet, and can guarantee between the neighbor cell edge mobile terminal noiseless so all the time.The edge mobile terminal of having described base station C1 and base station C2 among Fig. 3 takies the transition of frequency.As can see from Figure 3, to second time slot, the subclass F of base station C1
1Be updated to 2,4 frequencies, the subclass F of base station C2
2Be updated to 1,6 frequencies, the subclass F of base station C3
3Be updated to 3,5 frequencies; To the 3rd time slot, the subclass F of base station C1
1Be updated to 3,4 frequencies, the subclass F of base station C2
2Be updated to 2,5 frequencies, the subclass F of base station C3
3Be updated to 1,6.It is whole frequency band that each subclass keeps quadrature and each subclass sum constantly at each, guarantees that the frequency range that takies of each base station edge mobile terminal does not have conflict all the time, and the frequency of frequency hopping traversal is also different, can be in whole frequency frequency hopping.
After initial frequency hopping sub-band was selected, each cell edge portable terminal can not need inter base station communication according to the frequency hopping pattern frequency hopping.In order to adapt to the variation of edge mobile terminal bandwidth requirements, can consider that the frequency of adjacent sub-district is temporarily transferred negotiation.
But for the sub-band of frequency hopping sub-district less than the frequency hopping demand of its edge mobile terminal, promptly, the bandwidth requirements of edge cell portable terminal is greater than pre-assigned sub-band requirement, and then sub-band can be used to the adjacent sub-district of other shared same frequency hopping patterns by the base station in the sub-district; If consult successfully, then upgrade the subset of spectrum of sub-district correspondence, and one or more portable terminal can carry out frequency hopping according to frequency hopping pattern on the sub-band resource of using.Because initial frequency hopping frequency and frequency hopping pattern are known, can be easy to estimate that adjacent sub-district is at next frequency hopping point constantly.
The implementation method that a kind of frequency provided by the invention is used process can comprise the steps:
Step 1: this sub-district sends frequency to adjacent sub-district and uses indication information
At first, this cell base station estimates the frequency number that need use to adjacent sub-district according to this cell load situation, and then, this cell base station sends to the base station of adjacent sub-district and uses the frequency indication information; Wherein, use the frequency indication information and comprise one of following information at least: the frequency number that need use, the time of using (time stamp).Use the frequency indication information and be sent to relevant base station by inter-base station interface.
Step 2: adjacent sub-district receives frequency and uses indication information
Adjacent sub-district receives after frequency uses indication information, according to its cell load, and the frequency number whether decision is used and used.If refusal is used, then return frequency and use refusal information; If permission is used, then select the frequency sequence number that to use at random, and return frequency and use License Info.Use the frequency License Info and comprise following information at least: what receive uses time stamp, the sequence number vector of frequency after N frequency hopping of being used, frequency hopping times N.
Owing to the duration and the stepped-frequency interval time of using process are inconsistent, therefore need adjacent sub-district infer the current sequence number of frequency sequence number after N frequency hopping of being used according to frequency hopping pattern.(N frequency hopping time needs greater than using the process time delay)
Step 3: this sub-district receives from adjacent sub-district that frequency is used License Info or frequency is used refusal information
Use refusal information if receive frequency, then represent to use failure to this adjacent sub-district.
Using License Info if receive frequency, is benchmark to use time stamp then, on the frequency band subclass after frequency hopping N time, add current receive use the frequency sequence number.Simultaneously, send frequency to adjacent sub-district and use confirmation.Wherein, frequency is used confirmation and should be comprised following information: use time stamp and frequency hopping times N.
Step 4: adjacent sub-district receives the frequency confirmation
Adjacent sub-district receives after frequency uses information, is being benchmark to use time stamp, and the frequency band subclass after frequency hopping N time is deleted those and has been marked as the frequency sequence number of using.
Use process as shown in Figure 4, the consistent normal frequency hopping of preceding two time slots of Fig. 4 with Fig. 3, at second time slot, base station C1 finds that the bandwidth requirements of the terminal at its edge increases, but before secondment, can only defer to current frequency hopping sub-band.Send secondment information this moment, and this negotiations process is finished in a time slot (N=1).After base station C2 receives secondment information, and confirm and to temporarily transfer, and select current frequency 6, in returning secondment, add and temporarily transfer the frequency sequence number 5 of frequency 6 after next moment frequency hopping, and upgrade the frequency hopping subclass of the 3rd time slot for temporarily transferring frequency.Base station C1 receives the secondment information of returning, and frequency 5 is joined in the frequency hopping subclass of the 3rd time slot, and concurrent confirmation is given base station C2.At this moment, frequency 3,4,5 all belongs to base station C1, and base station C2 has only frequency 2 subclass, corresponding subclass F
1And F
2Also corresponding the renewal.According to former frequency hopping pattern rule, frequency 5 should belong to base station C2, but has used through consultation to base station C1 this moment.This kind frequency hopping mode still keeps between neighbor cell edge mobile terminal noiseless.On the other hand, if the bandwidth requirements of adjacent cell edge portable terminal is also big, may cause the merit of failing to consultations, then this sub-district part edge mobile terminal is carved at this moment and is not sent data, waits until down constantly and handles.
Normal united frequency hopping described above can unify to sum up in the point that Fig. 5 with the step of the united frequency hopping of using, as shown in Figure 5, if bandwidth requirements does not change, then the frequency in the frequency band subclass is still according to the frequency hopping pattern frequency hopping, if the bandwidth requirements of sub-district changes, then the minizone is by the communication interface between the base station, hold consultation as X2 interface, consulting to upgrade subset of spectrum under the case of successful, otherwise frequency is still according to the frequency hopping pattern frequency hopping in the subclass.
Simultaneously, the inter-cell united frequency hopping mode that provides of the embodiment of the invention also is very beneficial for the switching of edge mobile terminal.During switching,, therefore only need to change the frequency hopping point that switches portable terminal and get final product because frequency hopping pattern is consistent.
Described above mainly is the frequency-assignment problem of edge mobile terminal, for the frequency partition of inside, sub-district portable terminal, can do following consideration:
The first step: according to the method described above, pay the utmost attention to the Frequency Distribution of edge mobile terminal;
Second step: the no frequency band of edge mobile terminal is allocated to the inner portable terminal in sub-district uses, the frequency duplex factor as one that remains the minizone is 1, improves frequency efficiency.
In addition, in the present invention, if inner portable terminal adopts frequency selective scheduling (frequency selective scheduling) in the sub-district, then the chance that is scheduled of the portable terminal that channel condition is good is many, and the inner throughput in sub-district is big.Like this,, the entire throughput that had both guaranteed the sub-district can be reached, the speed of edge mobile terminal can be improved again by the frequency selective scheduling of the inner portable terminal in sub-district and the inter-cell united frequency hopping of cell edge portable terminal.
In addition, the present invention also provides a kind of ascending transmission method, and it realizes the uplink of a plurality of adjacent minizones by inter-cell united frequency hopping is combined with up receive diversity.
Particularly, as shown in Figure 6, comprise following processing according to the ascending transmission method of the embodiment of the invention:
Step S602, network are the initial frequency hopping sub-band of each cell allocation in a plurality of adjacent sub-districts on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, make that the initial frequency hopping sub-band of each sub-district is mutually orthogonal;
Step S604, one or more terminals of cell edge are based on the initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping;
Step S606, the signal that sends with the mode receiving terminal of diversity reception between the radio node of the radio node of the Serving cell of terminal and the adjacent sub-district of Serving cell.
Radio node above-mentioned is a remote radio unit (RRU) of distributed base station, and the signal that sends of the terminal that receives of different radio electrical nodes sends to same baseband processing unit and carries out diversity and merge.
Wherein, the operation of diversity reception is specially among the step S606: according to the signal of the frequency hopping pattern of terminal receiving terminal emission on the different radio node, and one of in the following manner carry out diversity and merge:
(mode one) selected to merge: the output of choosing a best radio node of signal to noise ratio from a plurality of radio node is as received signal;
(mode two) equal gain combining is carried out direct addition with the signal of a plurality of radio node with identical branch gain, and the signal after the addition is as received signal;
(mode three) high specific merges, and controls the merging branch gain of the signal of each radio node, make to merge branch gain and be directly proportional with the signal to noise ratio of the radio node branch road of Serving cell respectively, and then with signal plus as received signal.
The method that the embodiment of the invention provides both can be used for the transmission of terminal to the base station, also can be used for the transmission of base station to terminal.
Need to prove that in addition described above is the technical scheme of inter-cell united frequency hopping, but principle of the present invention and thought equally also are adapted to adjacent sectors.
As mentioned above, by technique scheme provided by the invention, than prior art, realized following beneficial effect at least: (1) has considered the frequency resource allocation of adjacent sub-district, guaranteed that the resource allocation of adjacent minizone does not conflict, guaranteed between the neighbor cell edge mobile terminal noiseless; (2) identical frequency hopping pattern frequency hopping in whole frequency is used in adjacent sub-district, making the glitch-free while between the portable terminal of adjacent minizone, has guaranteed the frequency hopping gain, has further improved the speed of edge mobile terminal.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. inter-cell united frequency hopping method is used for the united frequency hopping of a plurality of adjacent minizones, it is characterized in that, comprising:
Network is the initial frequency hopping sub-band of each cell allocation in described a plurality of adjacent sub-district on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, makes that the initial frequency hopping sub-band of each sub-district is mutually orthogonal;
One or more terminals of cell edge are based on the described initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of described a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping.
2. method according to claim 1 is characterized in that, describedly is specially for the operation of the initial frequency hopping sub-band of each cell allocation:
Multiplexer mode according to described a plurality of adjacent sub-districts is divided into a plurality of subset of spectrum with entire spectrum, and wherein, subset of spectrum is unit with the frequency, and any two subset of spectrum quadrature all;
Be respectively one of them subset of spectrum of each adjacent cell selecting as initial frequency hopping sub-band.
3. method according to claim 2 is characterized in that, further comprises:
Each frequency hopping is all upgraded frequency in the described subset of spectrum according to described frequency hopping pattern.
4. method according to claim 1 is characterized in that, described frequency hopping pattern is arranged so that the coherent communication frequency range of the difference on the frequency of twice frequency hopping greater than system.
5. according to each described method in the claim 2 to 4, it is characterized in that, further comprise:
But, use sub-band to other adjacent sub-districts for the sub-band of frequency hopping sub-district less than the frequency hopping demand of the terminal of its cell edge;
Using under the case of successful, upgrading the subset of spectrum of described sub-district correspondence, and described one or more terminal is carried out frequency hopping at the described sub-band of using according to described frequency hopping pattern;
Using under the situation of failure, the part terminal of described sub-district is not carried out data in current time slots and is sent.
6. according to each described method in the claim 1 to 4, it is characterized in that, further comprise:
But for the sub-band of the frequency hopping sub-district greater than the frequency hopping demand of the terminal of its cell edge, the subband allocation that will exceed the frequency hopping demand uses for the terminal of inside, described sub-district.
7. according to each described method in the claim 1 to 4, it is characterized in that, further comprise:
For the terminal that switches to adjacent sub-district from former persistent district, upgrade the subset of spectrum of described terminal correspondence.
8. an ascending transmission method is realized the uplink of a plurality of adjacent minizones by inter-cell united frequency hopping is combined with up receive diversity, it is characterized in that, comprising:
Network is the initial frequency hopping sub-band of each cell allocation in described a plurality of adjacent sub-district on the employed one group of frequency band of the fringe region of a plurality of adjacent sub-districts, makes that the initial frequency hopping sub-band of each sub-district is mutually orthogonal;
One or more terminals of cell edge are based on the described initial frequency hopping sub-band that distributes, on the employed one group of frequency band of the fringe region of described a plurality of adjacent sub-districts, according to identical frequency hopping pattern frequency hopping;
Mode with diversity reception between the radio node of the radio node of the Serving cell of terminal and the adjacent sub-district of described Serving cell receives the signal that described terminal sends.
9. method according to claim 8 is characterized in that, the operation that receives the signal that described terminal sends in the mode of diversity reception between the radio node of the radio node of the Serving cell of described terminal and the adjacent sub-district of described Serving cell is specially:
Receive the signal of described terminal emission according to the frequency hopping pattern of described terminal from different radio node, and one of in the following manner carry out diversity and merge:
The output of choosing a best radio node of signal to noise ratio from a plurality of radio node is as received signal;
The signal of a plurality of radio node is carried out direct addition with identical branch gain, and the signal after the addition is as received signal;
Control the merging branch gain of the signal of each radio node, described merging branch gain be directly proportional with the signal to noise ratio of the radio node branch road of described Serving cell respectively, and then with signal plus as received signal.
10. method according to claim 8 is characterized in that:
Described radio node is a remote radio unit (RRU) of distributed base station, and the signal that sends of the terminal that receives of different radio electrical nodes sends to same baseband processing unit and carries out diversity and merge.
11. to the borrowing method of adjacent local resource, it is characterized in that in the inter-cell united frequency hopping process, comprising:
This sub-district sends frequency to adjacent sub-district and uses indication information;
Described this sub-district receives frequency from described adjacent sub-district and uses License Info;
Described this sub-district sends frequency to described adjacent sub-district and uses confirmation, and upgrades the frequency hopping subclass of described this sub-district;
Described adjacent sub-district receives described frequency and uses confirmation, and upgrades the frequency hopping subclass of described this sub-district.
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