CN105636003A - Resource selection method and device - Google Patents
Resource selection method and device Download PDFInfo
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- CN105636003A CN105636003A CN201410597401.XA CN201410597401A CN105636003A CN 105636003 A CN105636003 A CN 105636003A CN 201410597401 A CN201410597401 A CN 201410597401A CN 105636003 A CN105636003 A CN 105636003A
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Abstract
The invention provides a resource selection method comprising steps that according to an identifier of a discovery subframe and an identifier of a PRB where a terminal sends a discovery signal in the (i-1)th discovery period, a terminal determines, in the ith discovery period, an identifier of a discovery subframe where the discover signal is sent in the ith discovery period; and the terminal, according to the identifier of the PRB where the terminal sends the discover signal in the (i-1)th discovery period, determines the identifier of the PRB where the discover signal is sent in the ith discovery period, wherein the i is an integer greater than 1. Based on the same concept, the invention further provides a resource selection device capable of reducing interference between terminals and increasing the discovery performance of the terminals.
Description
Technical field
The present invention relates to communication technical field, particularly to a kind of resource selection method and device.
Background technology
Terminal direct connection technology is the direct communication mode between terminal, it is possible to use when there being the network coverage, is used for reducing offered load, it is also possible to use in without the network coverage, in the scene of public safety.
Terminal discovery mechanism is to have fixed number subframe each discovery cycle as finding subframe, signal is found for each terminal, the mode randomly choosed is adopted when usual each terminal finds the resource of signal, such discovery mechanism there will be different terminals at identical Physical Resource Block (PhysicalRB, PRB) upper or identical discovery subframe sends discovery signal, cause can not detecting between terminal the other side.
Summary of the invention
In view of this, the application provides a kind of resource selection method and device, to solve the problem that terminal can not detect the other side mutually.
For solving above-mentioned technical problem, the technical scheme of the application is achieved in that
A kind of resource selection method, the method includes:
In i-th, terminal finds the i-th-1 discovery cycle transmission, the cycle finds that the mark of discovery subframe of signal and the mark of PRB determine that i-th finds that cycle transmission finds the mark of the discovery subframe of signal according to this terminal;
Determine that i-th finds that the cycle sends the mark of the PRB finding signal according to this terminal in the mark that the i-th-1 discovery cycle sends the PRB finding signal; Wherein, i is the integer more than 1.
A kind of resource selection device, this device includes: memory element and determine unit;
Described memory element, sends the mark of the discovery subframe finding signal and the mark of PRB for being stored in the i-th-1 discovery cycle; Wherein, i is the integer more than 1;
Described determine unit, for finding that in i-th the mark of the mark and PRB that send the discoverys subframe finding signal the i-th-1 discovery cycle that the cycle stores according to described memory element determines that i-th finds that the cycle sends the mark of the discovery subframe of discovery signal; Determine that i-th finds that the cycle sends the mark of the PRB finding signal according to the mark sending the PRB finding signal the i-th-1 discovery cycle.
From technical scheme above, the discovery subframe finding signal by introducing previous this terminal of discovery cycle to send in the application and PRB determine that the current discovery cycle sends the discovery subframe and PRB that find signal, the interference of terminal room can be reduced, improve the discovery performance of terminal.
Accompanying drawing explanation
Fig. 1 is resource selection method schematic flow sheet in the embodiment of the present application;
Fig. 2 is the apparatus structure schematic diagram being applied to above-mentioned technology in the embodiment of the present application.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing and according to embodiment, technical scheme is described in detail.
The application provides a kind of resource selection method, the discovery subframe finding signal by introducing previous this terminal of discovery cycle to send and PRB determine that the current discovery cycle sends the discovery subframe and PRB that find signal, the interference of terminal room can be reduced, improve the discovery performance of terminal.
It is resource selection method schematic flow sheet in the embodiment of the present application referring to Fig. 1, Fig. 1. Concretely comprise the following steps:
Step 101, in i-th, terminal finds the i-th-1 discovery cycle transmission, the cycle finds that the mark of discovery subframe of signal and the mark of PRB determine that i-th finds that cycle transmission finds the mark of the discovery subframe of signal according to this terminal.
In this step, i is the integer more than 1, finds the cycle for the 1st, and this terminal randomly chooses and finds subframe and PRB corresponding to this discovery subframe. Namely find that the cycle selects the realization finding the resource of signal compared with realization first.
Terminal can select in each discovery cycle to send the resource finding signal, select to send the resource finding signal and namely determine when which PRB transmission of use finds signal, need to first determine and which finds in subframe at, then determine which PRB in the discovery subframe determined sends discovery signal.
First, need to first select to find subframe, when the mark finding subframe uses Digital ID, the mark of the mark and PRB that send, the i-th-1 discovery cycle, the discovery subframe finding signal according to this terminal determines that i-th finds that the cycle sends the mark of the discovery subframe finding signal, including:
This terminal finds that by the i-th-1 the cycle sends the mark of the discovery subframe finding signal and the sum of the mark of PRB, as i-th, remainder with finding in 1 discovery cycle that number of sub-frames obtains after carrying out remainder calculating, finds that the cycle sends the mark of the discovery subframe finding signal.
The i-th-1 discovery cycle sends the mark of the discovery subframe finding signal to use SF (i-1) to represent, PRB (i-1) represents that the i-th-1 discovery cycle sends the mark of PRB corresponding to the discovery subframe finding signal, nSFRepresent discovery number of sub-frames in 1 discovery cycle, then i-th finds that the cycle sends the mark SF (i) of the discovery subframe finding signal and is:
SF (i)=mod ([SF (i-1)+PRB (i-1)], nSF)��
Step 102, in the mark that the i-th-1 discovery cycle sends the PRB finding signal, this terminal determines that i-th finds that the cycle sends the mark of the PRB finding signal according to this terminal.
This step specifically includes:
This terminal finds that by the i-th-1 the cycle sends the mark of the PRB finding signal and the sum of random number, as i-th, the remainder obtained after carrying out remainder calculating with PRB number in 1 discovery cycle finds that the cycle sends the mark of the PRB finding signal.
The i-th-1 discovery cycle sends the mark of the PRB finding signal to use PRB (i-1) to represent, K represents random number, nRBRepresent that 1 finds the number of PRB in subframe, then i-th finds that the cycle sends the mark PRB (i) of the PRB finding signal and is:
PRB (i)=mod ([PRB (i-1)+K], nRB)��
When implementing, if K value is non-integer, then can use and round up, or the mode that rounds downwards calculates PRB (i).
This terminal, when determining the mark identified with PRB that the current discovery cycle sends the discovery subframe finding signal, stores, and determines the mark of mark and the PRB sending the discovery subframe finding signal in order to next discovery cycle.
When the current discovery subframe mark finding cycle transmission discovery signal of storage and PRB mark, it is possible to the previous discovery cycle that deletion stores sends the discovery subframe mark finding signal and identifies with PRB, it is also possible to do not delete.
Assume have 64 find subframe in a discovery cycle, each discovery subframe has 44 PRB. At the 4th, this terminal finds that this terminal of cycle finds signal upper transmission of discovery subframe 25, PRB40, random number K selects 20, it is determined that this terminal sends being designated of the discovery subframe of discovery signal the 5th discovery cycle:
SF (5)=mod ([SF (5-1)+PRB (5-1)], 64)=mod ([20+40], 64)=4.
Then determine that the 5th discovery cycle sends being designated of the PRB of discovery signal:
PRB (5)=mod ([PRB (5-1)+25], 44)=mod ([40+25], 44)=21.
Finally, determine that transmission finds signal on the PRB21 finding subframe 4 correspondence in the 5th this terminal of discovery cycle.
By the technical scheme that the application provides, the D2DUEs taking identical subframe still different PRB can jump in the different subframes of next cycle, it is thus possible to find each other, by frequency frequency hopping, the D2DUEs taking identical PRBs can jump on identical subframe difference PRB, and by time domain frequency hopping, it is possible to jump in different subframes in the next cycle. If nSF is less, when side frequency resource in two identical subframes of CU, very big chance is just assigned in the different subframes of next cycle.
The embodiment of the present application reduces by two probability finding that terminal is collided on running time-frequency resource by resource hop mode, thus increasing the probability that terminal finds.
Find, on the basis of random resource allocation, by controlling the mode of terminal resource saltus step, to reduce the probability that terminal is collided in identical subframe or same frequency at terminal direct communication, it is possible to reduce the interference of terminal, improve terminal and find performance.
Based on same inventive concept, the application also proposes a kind of resource selection device. It it is the apparatus structure schematic diagram being applied to above-mentioned technology in the embodiment of the present application referring to Fig. 2, Fig. 2. This device includes: memory element 201 and determine unit 202;
Memory element 201, sends the mark of the discovery subframe finding signal and the mark of PRB for being stored in the i-th-1 discovery cycle; Wherein, i is the integer more than 1;
Determine unit 202, for finding the i-th-1 discovery cycle transmission, the cycle finds that the mark of discovery subframe of signal and the mark of PRB determine that i-th finds that cycle transmission finds the mark of the discovery subframe of signal according to what memory element 201 stored in i-th; Determine that i-th finds that the cycle sends the mark of the PRB finding signal according to the mark sending the PRB finding signal the i-th-1 discovery cycle.
It is preferred that
Memory element 201, is further used for storing and determines that the i-th that unit 202 is determined finds that the cycle sends discovery subframe mark and the PRB mark of signal.
It is preferred that
Determine unit 202, specifically for when the mark of the mark and RRB that find subframe uses numeral to represent, the cycle that finds the i-th-1 sends the mark of the discovery subframe finding signal and the sum of the mark of PRB, as i-th, remainder with finding in 1 discovery cycle that number of sub-frames obtains after carrying out remainder calculating, finds that the cycle sends the mark of the discovery subframe finding signal; The i-th-1 is found, and the cycle sends the mark of the PRB finding signal and the sum of random number, the remainder obtained after carrying out remainder calculating with PRB number in 1 discovery cycle, find that the cycle sends the mark of the PRB finding signal as i-th.
It is preferred that
Determine unit 202, be further used for randomly choosing the 1st discovery cycle finding that subframe and PRB corresponding to this discovery subframe send and finding signal.
The unit of above-described embodiment can be integrated in one, it is also possible to separates and disposes; A unit can be merged into, it is also possible to be further split into multiple subelement.
In sum, the application finds signal by introducing previous this terminal of discovery cycle to send discovery subframe and PRB determine that the current discovery cycle sends the discovery subframe and PRB that find signal, it is possible to reduce the interference of terminal room, improve the discovery performance of terminal.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within the scope of protection of the invention.
Claims (8)
1. a resource selection method, it is characterised in that the method includes:
In i-th, terminal finds the i-th-1 discovery cycle transmission, the cycle finds that the mark of discovery subframe of signal and the mark of Physical Resource Block PRB determine that i-th finds that the cycle sends the mark of the discovery subframe finding signal according to this terminal;
Determine that i-th finds that the cycle sends the mark of the PRB finding signal according to this terminal in the mark that the i-th-1 discovery cycle sends the PRB finding signal; Wherein, i is the integer more than 1.
2. method according to claim 1, it is characterised in that described method farther includes:
The i-th that storage is determined finds that the cycle sends discovery subframe mark and the PRB mark of signal.
3. method according to claim 1, it is characterized in that, when the mark of the mark and RRB that find subframe uses numeral to represent, the mark of the described mark and PRB sending the discovery subframe finding signal the i-th-1 discovery cycle according to this terminal determines that i-th finds that the cycle sends the mark of the discovery subframe finding signal, including:
The cycle that finds the i-th-1 sends the mark of the discovery subframe finding signal and the sum of the mark of PRB, as i-th, remainder with finding in 1 discovery cycle that number of sub-frames obtains after carrying out remainder calculating, finds that the cycle sends the mark of the discovery subframe finding signal;
The mark of the described PRB sending discovery signal according to this terminal the i-th-1 discovery cycle determines that i-th finds that the cycle sends the mark of the PRB finding signal, including:
The i-th-1 is found, and the cycle sends the mark of the PRB finding signal and the sum of random number, the remainder obtained after carrying out remainder calculating with PRB number in 1 discovery cycle, find that the cycle sends the mark of the PRB finding signal as i-th.
4. the method according to claim 1-3 any one, it is characterised in that described method farther includes:
This terminal randomly chooses the 1st discovery cycle and finds that subframe and PRB corresponding to this discovery subframe send and find signal.
5. a resource selection device, it is characterised in that this device includes: memory element and determine unit;
Described memory element, sends the mark of the discovery subframe finding signal and the mark of Physical Resource Block PRB for being stored in the i-th-1 discovery cycle; Wherein, i is the integer more than 1;
Described determine unit, for finding that in i-th the mark of the mark and PRB that send the discoverys subframe finding signal the i-th-1 discovery cycle that the cycle stores according to described memory element determines that i-th finds that the cycle sends the mark of the discovery subframe of discovery signal; Determine that i-th finds that the cycle sends the mark of the PRB finding signal according to the mark sending the PRB finding signal the i-th-1 discovery cycle.
6. device according to claim 5, it is characterised in that
Described memory element, is further used for the described i-th determining that unit is determined of storage and finds that the cycle sends discovery subframe mark and the PRB mark of signal.
7. method according to claim 5, it is characterised in that
Described determine unit, specifically for when the mark of the mark and RRB that find subframe uses numeral to represent, the cycle that finds the i-th-1 sends the mark of the discovery subframe finding signal and the sum of the mark of PRB, as i-th, remainder with finding in 1 discovery cycle that number of sub-frames obtains after carrying out remainder calculating, finds that the cycle sends the mark of the discovery subframe finding signal; The i-th-1 is found, and the cycle sends the mark of the PRB finding signal and the sum of random number, the remainder obtained after carrying out remainder calculating with PRB number in 1 discovery cycle, find that the cycle sends the mark of the PRB finding signal as i-th.
8. the device according to claim 5-7 any one, it is characterised in that
Described determine unit, be further used for randomly choosing the 1st discovery cycle finding that subframe and PRB corresponding to this discovery subframe send and find signal.
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| CN201410597401.XA CN105636003B (en) | 2014-10-30 | 2014-10-30 | A kind of method and apparatus of resource selection |
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| CN201410597401.XA CN105636003B (en) | 2014-10-30 | 2014-10-30 | A kind of method and apparatus of resource selection |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103250435A (en) * | 2012-12-31 | 2013-08-14 | 华为技术有限公司 | Device to device communication method, apparatus and system |
| CN103997727A (en) * | 2013-02-18 | 2014-08-20 | 中兴通讯股份有限公司 | Device discovery method and apparatus |
| CN104796845A (en) * | 2014-01-16 | 2015-07-22 | 电信科学技术研究院 | A D2D signal transmission method and equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103250435A (en) * | 2012-12-31 | 2013-08-14 | 华为技术有限公司 | Device to device communication method, apparatus and system |
| CN103997727A (en) * | 2013-02-18 | 2014-08-20 | 中兴通讯股份有限公司 | Device discovery method and apparatus |
| CN104796845A (en) * | 2014-01-16 | 2015-07-22 | 电信科学技术研究院 | A D2D signal transmission method and equipment |
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Effective date of registration: 20211228 Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF INFORMATION AND COMMUNICATIONS Address before: 100045 Beijing city Xicheng District Yuetan Nan Street 11 Patentee before: The Research Institute of Telecommunications Transmission MIIT |
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