CN105049395A - OFDM-based distributed terminal combined scheduling method - Google Patents
OFDM-based distributed terminal combined scheduling method Download PDFInfo
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- CN105049395A CN105049395A CN201510389970.XA CN201510389970A CN105049395A CN 105049395 A CN105049395 A CN 105049395A CN 201510389970 A CN201510389970 A CN 201510389970A CN 105049395 A CN105049395 A CN 105049395A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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Abstract
The invention discloses an OFDM-based distributed terminal combined scheduling method. Distributed terminals detect frequency domain carrier information positions used by other distributed terminals, and the frequency domain carrier information positions are combined with other data information. An OFDM-based central control station processes the combined data information to realize combined processing gain.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of distributed terminal combined scheduling method based on OFDM.
Background technology
In recent years, along with the development of mobile communication technology, although the tenability of communication system to radio communication service is significantly improved, user there has also been higher expectation to two-forty, high-quality multimedia service simultaneously.Therefore, in the research of next generation mobile communication technology, higher requirement be it is also proposed to aspects such as spectrum efficiency, transmission rate, throughput of system and cell-edge performance.
The access way of OFDM makes the information of intra-cell users be carried in mutually orthogonal different sub carrier, effectively prevent the multi-access inference between intra-cell users, but presence of intercell interference cannot suppress.For Cell Edge User, useful signal intensity is little, simultaneously large from the interference signal intensity of neighbor cell, which has limited the signal to noise ratio (SINR) of Cell Edge User, cause its throughput degradation, make edge customer can not get satisfied service quality, seriously constrain the raising of systematic function and system fairness.
Along with the development of distributed proccessing, make to be that the multiple terminals of dispersing morphology or the Combined Treatment of multinode become possibility, greatly can improve the calculation process efficiency of whole system, also can effectively integrate the frequency spectrum resource of whole system, there is vast potential for future development.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the specific embodiment of the present invention, propose a kind of distributed terminal combined scheduling method based on OFDM, described method comprises:
S1, distributed terminal T1 detect the frequency domain carriers information position that other distributed terminals use;
S2, distributed terminal T1 carry out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
S3, based on the central control station of OFDM, the NID of distributed terminal T2 is sent to distributed terminal T1;
S4, distributed terminal T1 resolve and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM;
S5, based on the central control station of OFDM by processing the data message after S4 compound, realize Combined Treatment gain.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S1 detects the frequency domain carriers information position that other distributed terminals use and specifically comprises:
Distributed terminal T1 with its directly under the central control station based on OFDM carry out alternately, when sending data message, select a untapped reverse subband, distributed terminal T1 by protocol processes detect around it with or without other distributed terminals T with distributed terminal T1 directly under the central control station based on OFDM send its data message, when not detecting that other distributed terminals T is when sending data message, next untapped reverse subband is selected to continue to detect; When having detected that other distributed terminals T is when sending data message, distributed terminal T1 can detect the frequency domain carriers information position of lasting several other distributed terminals uses that signal strength signal intensity is maximum, performs S2.
According to the specific embodiment of the present invention, described protocol processes specifically comprises:
Distributed terminal T1 obtains single file data after reception data are removed protection interval; this single file data transaction is become concurrent data; fourier translation operation is carried out to this concurrent data; to obtain frequency domain carriers intensity; intensity statistics is carried out to frequency domain carriers intensity; obtain the mean intensity of frequency domain carriers on whole subband, detected the several frequency domain carriers positional informations that whether there is the maximum and position of intensity and continue by this mean intensity.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S2 carries out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM specifically comprise:
Distributed terminal T1 is on the reverse enhancing shared channel not having control signal compound, S1 is detected the frequency domain carriers positional information of lasting several other distributed terminals uses that signal strength signal intensity is maximum processes, then carry out compound with data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
Distributed terminal T1 is on the reverse enhancing shared channel having control signal compound, S1 is detected frequency domain carriers positional information coding, the bit of lasting several other distributed terminals uses that signal strength signal intensity is maximum carry out OFDM modulation after retransmitting, last with control signal and reverse strengthen shared channel information combined after, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
According to the specific embodiment of the present invention, the NID of distributed terminal T2 is sent to distributed terminal T1 and specifically comprises by the central control station based on OFDM of described step S3:
Central control station based on OFDM carries out solution compound to the data message that S2 sends, obtain distributed terminal T1 by decoding after separating compound and the frequency domain carriers positional information that distributed terminal T2 uses detected, this distributed terminal T2 occupies the maximum distributed terminal of frequency domain carriers number, extract the NID of distributed terminal T2, and this NID is sent to distributed terminal T1.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S4 resolves and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM comprise:
After distributed terminal T1 receives the NID of distributed terminal T2, resolve its data message, data message after resolving and the data message of distributed terminal T1 are carried out compound, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
According to the specific embodiment of the present invention, the central control station based on OFDM of described step S5, by processing the data message after S4 compound, realizes Combined Treatment gain and specifically comprises:
Based on the central control station of OFDM by processing the data message after S4 compound, the twice of the distributed terminal T1 determined with S4 based on the central control station of OFDM and the modulation rate of distributed terminal T2 is resolved, and obtaining distributed terminal T1 by combined dispatching is the data message that distributed terminal T2 sends;
The gain compounds such as the data message of the distributed terminal T2 sent in data message and S4 after compound by the distributed terminal T2 received based on the central control station of OFDM carries out, realize Combined Treatment gain.
Beneficial effect: the distributed terminal combined scheduling method based on OFDM of the present invention, is detected the frequency domain carriers information position of other distributed terminals use, and carries out compound with data message by distributed terminal; Based on the central control station of OFDM by processing the data message after compound, realize Combined Treatment gain.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Figure 1 show the distributed terminal combined scheduling method flow chart based on OFDM according to embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
According to the embodiment of the present invention, propose a kind of distributed terminal combined scheduling method based on OFDM, as shown in Figure 1, described method comprises:
S1, distributed terminal T1 detect the frequency domain carriers information position that other distributed terminals use;
S2, distributed terminal T1 carry out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
S3, based on the central control station of OFDM, the NID of distributed terminal T2 is sent to distributed terminal T1;
S4, distributed terminal T1 resolve and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM;
S5, based on the central control station of OFDM by processing the data message after S4 compound, realize Combined Treatment gain.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S1 detects the frequency domain carriers information position that other distributed terminals use and specifically comprises:
Distributed terminal T1 with its directly under the central control station based on OFDM carry out alternately, when sending data message, select a untapped reverse subband, distributed terminal T1 by protocol processes detect around it with or without other distributed terminals T with distributed terminal T1 directly under the central control station based on OFDM send its data message, when not detecting that other distributed terminals T is when sending data message, next untapped reverse subband is selected to continue to detect; When having detected that other distributed terminals T is when sending data message, distributed terminal T1 can detect the frequency domain carriers information position of lasting several other distributed terminals uses that signal strength signal intensity is maximum, performs S2.
According to the specific embodiment of the present invention, described protocol processes specifically comprises:
Distributed terminal T1 obtains single file data after reception data are removed protection interval; this single file data transaction is become concurrent data; fourier translation operation is carried out to this concurrent data; to obtain frequency domain carriers intensity; intensity statistics is carried out to frequency domain carriers intensity; obtain the mean intensity of frequency domain carriers on whole subband, detected the several frequency domain carriers positional informations that whether there is the maximum and position of intensity and continue by this mean intensity.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S2 carries out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM specifically comprise:
Distributed terminal T1 is on the reverse enhancing shared channel not having control signal compound, S1 is detected the frequency domain carriers positional information of lasting several other distributed terminals uses that signal strength signal intensity is maximum processes, then carry out compound with data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
Distributed terminal T1 is on the reverse enhancing shared channel having control signal compound, S1 is detected frequency domain carriers positional information coding, the bit of lasting several other distributed terminals uses that signal strength signal intensity is maximum carry out OFDM modulation after retransmitting, last with control signal and reverse strengthen shared channel information combined after, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
According to the specific embodiment of the present invention, when described distributed terminal T1 is on the reverse enhancing shared channel not having control signal compound, S1 is detected the frequency domain carriers positional information of lasting several other distributed terminals uses that signal strength signal intensity is maximum processes, then carries out compound with data message and specifically comprise:
With
table of bits is shown with the frequency domain carriers original position that data send, and wherein N is oppositely total frequency domain carriers number,
With
table of bits is shown with the frequency domain carriers number that data send, will
individual bit carries out precoding processing,
When individual
when bit is not more than 12 bit, adopts square to block encoding scheme (BTC), export 2
5bit;
When
when bit is greater than 12 bit, carry out precoding with error correction coding, then carry out bit repeating transmission, the bit number 2 after bit repeating transmission
5, bit carries out OFDM modulation after retransmitting, and carries out compound reverse enhancing on shared channel.
According to the specific embodiment of the present invention, described distributed terminal T1 is on the reverse enhancing shared channel having control signal compound, S1 is detected frequency domain carriers positional information coding that maximum lasting several other distributed terminals of signal strength signal intensity use, bit carries out OFDM modulation after retransmitting, last with control signal and oppositely strengthen that shared channel is information combined specifically to be comprised:
First allocating pre-coding matrix instruction (PMI) information, with past low from height, the mode configured by row, complete the configuration of PMI information, then by channel quality information (CQI) with oppositely strengthen shared channel information and dock, channel quality information is front, reverse enhancing shared channel information is rear, with past low from height, the mode configured line by line completes channel quality information and oppositely strengthens the configuration of shared channel information, and blank spaces is reverse enhancing shared channel information; Then acknowledge character information and frequency domain carriers information are docked, acknowledge character is front, and frequency domain carriers information is rear, and with from low to high, the mode configured line by line completes the configuration of acknowledge character and frequency domain carriers information.
According to the specific embodiment of the present invention, the NID of distributed terminal T2 is sent to distributed terminal T1 and specifically comprises by the central control station based on OFDM of described step S3:
Central control station based on OFDM carries out solution compound to the data message that S2 sends, obtain distributed terminal T1 by decoding after separating compound and the frequency domain carriers positional information that distributed terminal T2 uses detected, this distributed terminal T2 occupies the maximum distributed terminal of frequency domain carriers number, extract the NID of distributed terminal T2, and this NID is sent to distributed terminal T1.
According to the specific embodiment of the present invention, the concrete steps of the NID of described extraction distributed terminal T2 are:
Combined dispatching unit based on the central control station of OFDM finds out the correlation distribution formula terminal equipment using these frequency domain carriers recently,
If these frequency domain carriers occupied by a distributed terminal, then it can be used as distributed terminal T2, and extract its NID;
If these frequency domain carriers are occupied by multiple distributed terminal, so extract and occupy the maximum distributed terminal of frequency domain carriers number as distributed terminal T2, and extract its NID.
According to the specific embodiment of the present invention, the distributed terminal T1 of described step S4 resolves and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM comprise:
After distributed terminal T1 receives the NID of distributed terminal T2, resolve its data message, data message after resolving and the data message of distributed terminal T1 are carried out compound, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
According to the specific embodiment of the present invention, after described distributed terminal T1 receives the NID of distributed terminal T2, the concrete steps of resolving its data message are:
When distributed terminal T1 and distributed terminal T2 occupies same sub-band, distributed terminal T1 sends oneself data message, does not go the information of resolving distributed terminal T2;
When distributed terminal T1 and distributed terminal T2 occupies different subbands, distributed terminal T1 sends the data message of oneself at the subband of oneself, at the subband that distributed terminal T2 occupies, distributed terminal T1 utilizes the frequency spectrum resource about distributed terminal T2 that parsed and modulation coding mode to parse the data of distributed terminal T2.
According to the specific embodiment of the present invention, described concrete steps of the data message after resolving and the data message of distributed terminal T1 being carried out compound are:
Distributed terminal T1 detects the next oppositely bandwidth that subband occupies of distributed terminal T1 and whether is less than the bandwidth that distributed terminal T2 that distributed terminal T1 parses occupies:
If the next oppositely bandwidth that subband occupies of distributed terminal T1 is less than the bandwidth that distributed terminal T2 that distributed terminal T1 parses occupies, then distributed terminal T1 sends the data of oneself at this subband, loses the data of distributed terminal T2;
If the next oppositely bandwidth that subband occupies of distributed terminal T1 is more than or equal to the bandwidth that distributed terminal T2 that distributed terminal T1 parses occupies, then distributed terminal T1 is by the data at the next one reverse subbands complex distributed terminal T2; Its modulation rate increases and is twice by distributed terminal T1 and distributed terminal T2, configures line by line from low to high, when distributed terminal T2 occupy bandwidth be less than distributed terminal T1 time, remaining subcarrier is idle.
According to the specific embodiment of the present invention, the central control station based on OFDM of described step S5, by processing the data message after S4 compound, realizes Combined Treatment gain and specifically comprises:
Based on the central control station of OFDM by processing the data message after S4 compound, the twice of the distributed terminal T1 determined with S4 based on the central control station of OFDM and the modulation rate of distributed terminal T2 is resolved, and obtaining distributed terminal T1 by combined dispatching is the data message that distributed terminal T2 sends;
The gain compounds such as the data message of the distributed terminal T2 sent in data message and S4 after compound by the distributed terminal T2 received based on the central control station of OFDM carries out, realize Combined Treatment gain.
The operation principle of the above-mentioned distributed terminal combined scheduling method based on OFDM of the present invention is:
Distributed terminal T1 communicates directly under the central control station based on OFDM with it, send data message, another distributed terminal T2 is had also to communicate with the same central control station based on OFDM near distributed terminal T1, send its data message, and distributed terminal T1 occupies different frequency spectrum resources from distributed terminal T2, namely different reverse subbands.Due to distributed terminal T1 and distributed terminal T2 close together, distributed terminal T1 can detect the frequency spectrum resource occupied by distributed terminal T2, afterwards, distributed terminal T1 will detect relevant frequency spectrum resource occupies the data message compound of information and distributed terminal T1, and send to the central control station based on OFDM, based on the central control station of OFDM learn distributed terminal T1 its information of distributed terminal T2 detected after the NID of distributed terminal T2 is sent to distributed terminal T1, afterwards, the spectrum position that distributed terminal T1 utilizes the NID of distributed terminal T2 to occupy at distributed terminal T2, resolve its data message, the data message of itself and distributed terminal T1 is carried out compound and sends to the central control station based on OFDM, realize the combined dispatching communication between two distributed terminal T.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (7)
1., based on a distributed terminal combined scheduling method of OFDM, described method comprises:
S1, distributed terminal T1 detect the frequency domain carriers information position that other distributed terminals use;
S2, distributed terminal T1 carry out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
S3, based on the central control station of OFDM, the NID of distributed terminal T2 is sent to distributed terminal T1;
S4, distributed terminal T1 resolve and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM;
S5, based on the central control station of OFDM by processing the data message after S4 compound, realize Combined Treatment gain.
2. a method of claim 1, the distributed terminal T1 of described step S1 detects the frequency domain carriers information position that other distributed terminals use and specifically comprises:
Distributed terminal T1 with its directly under the central control station based on OFDM carry out alternately, when sending data message, select a untapped reverse subband, distributed terminal T1 by protocol processes detect around it with or without other distributed terminals T with distributed terminal T1 directly under the central control station based on OFDM send its data message, when not detecting that other distributed terminals T is when sending data message, next untapped reverse subband is selected to continue to detect; When having detected that other distributed terminals T is when sending data message, distributed terminal T1 can detect the frequency domain carriers information position of lasting several other distributed terminals uses that signal strength signal intensity is maximum, performs S2.
3. a method as claimed in claim 2, described protocol processes specifically comprises:
Distributed terminal T1 obtains single file data after reception data are removed protection interval; this single file data transaction is become concurrent data; fourier translation operation is carried out to this concurrent data; to obtain frequency domain carriers intensity; intensity statistics is carried out to frequency domain carriers intensity; obtain the mean intensity of frequency domain carriers on whole subband, detected the several frequency domain carriers positional informations that whether there is the maximum and position of intensity and continue by this mean intensity.
4. a method as claimed in claim 3, the distributed terminal T1 of described step S2 carries out compound to data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM specifically comprise:
Distributed terminal T1 is on the reverse enhancing shared channel not having control signal compound, S1 is detected the frequency domain carriers positional information of lasting several other distributed terminals uses that signal strength signal intensity is maximum processes, then carry out compound with data message, the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM;
Distributed terminal T1 is on the reverse enhancing shared channel having control signal compound, S1 is detected frequency domain carriers positional information coding, the bit of lasting several other distributed terminals uses that signal strength signal intensity is maximum carry out OFDM modulation after retransmitting, last with control signal and reverse strengthen shared channel information combined after, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
5. a method as claimed in claim 4, the NID of distributed terminal T2 is sent to distributed terminal T1 and specifically comprises by the central control station based on OFDM of described step S3:
Central control station based on OFDM carries out solution compound to the data message that S2 sends, obtain distributed terminal T1 by decoding after separating compound and the frequency domain carriers positional information that distributed terminal T2 uses detected, this distributed terminal T2 occupies the maximum distributed terminal of frequency domain carriers number, extract the NID of distributed terminal T2, and this NID is sent to distributed terminal T1.
6. a method as claimed in claim 5, the distributed terminal T1 of described step S4 resolves and the data message of Compound Distribution formula terminal T2, then send to distributed terminal T1 directly under the central control station based on OFDM comprise:
After distributed terminal T1 receives the NID of distributed terminal T2, resolve its data message, data message after resolving and the data message of distributed terminal T1 are carried out compound, and the data message after compound is sent to distributed terminal T1 directly under the central control station based on OFDM.
7. a method as claimed in claim 6, the central control station based on OFDM of described step S5, by processing the data message after S4 compound, realizes Combined Treatment gain and specifically comprises:
Based on the central control station of OFDM by processing the data message after S4 compound, the twice of the distributed terminal T1 determined with S4 based on the central control station of OFDM and the modulation rate of distributed terminal T2 is resolved, and obtaining distributed terminal T1 by combined dispatching is the data message that distributed terminal T2 sends;
The gain compounds such as the data message of the distributed terminal T2 sent in data message and S4 after compound by the distributed terminal T2 received based on the central control station of OFDM carries out, realize Combined Treatment gain.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684845A (en) * | 2012-06-11 | 2012-09-19 | 哈尔滨工业大学 | Multiterminal cooperative communication method for LTE (Long Term Evolution) system |
| EP2704513A1 (en) * | 2011-04-27 | 2014-03-05 | Sharp Kabushiki Kaisha | Terminal, base station, communication system, and communication method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2704513A1 (en) * | 2011-04-27 | 2014-03-05 | Sharp Kabushiki Kaisha | Terminal, base station, communication system, and communication method |
| CN102684845A (en) * | 2012-06-11 | 2012-09-19 | 哈尔滨工业大学 | Multiterminal cooperative communication method for LTE (Long Term Evolution) system |
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Application publication date: 20151111 |