CN101364853B - Carrier sensing method for multi-point access system - Google Patents
Carrier sensing method for multi-point access system Download PDFInfo
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- CN101364853B CN101364853B CN2007100446703A CN200710044670A CN101364853B CN 101364853 B CN101364853 B CN 101364853B CN 2007100446703 A CN2007100446703 A CN 2007100446703A CN 200710044670 A CN200710044670 A CN 200710044670A CN 101364853 B CN101364853 B CN 101364853B
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Abstract
A carrier sensing method of a multi-point access system comprises the following steps: (1) transmitting a data transmission request to a media access layer; (2) packing data to be transmitted to a data frame consisting of N sub-frames with a given signal sub-frame inserted therein; (3) checking to determine whether the given signal sub-frame is present in public control channel access signals and, if so, turning to step (4), or else, turning to step (6); (4) decoding the given signal sub-frame to obtain the sub-frame number of the signal; (5) waiting for (N-SFN)*t, and retuning to step (2) for further sensing when the detected data frame is ended; and (6) transmitting the data frame by the user. The method can accurately sense carrier, and can predict when a channel is idle if the channel is busy. The method has the advantages of improved system efficiency and power saving.
Description
Technical field
The present invention relates to the carrier sensing method of carrier sense technology, particularly a kind of multi-point access system.
Background technology
In multi-point access system, have a plurality of users at synchronization and send Frame simultaneously, for fear of conflict, must carry out carrier sense before the Access Layer busy channel, acknowledgement channel is in the free time.
In existing carrier sense technology, generally all be to judge by detected energy, under noisy situation, especially in the wireless system, thereby this detection method is judged (free time being judged to busy) easily by accident is caused the reduction of system effectiveness, is in when busy detecting channel simultaneously, when this detection method can't be predicted channel will recover idle, intercept once more after can only intercepting always or wait for a random time, this has brought the terminal power consumption, has also reduced the efficient of system.
Summary of the invention
The present invention is for overcoming above-mentioned prior art shortcoming, and purpose provides a kind of carrier sensing method of multi-point access system.
For achieving the above object, technical scheme of the present invention is:
A kind of carrier sensing method of multi-point access system is characterized in that this method may further comprise the steps:
Step (1): the medium Access Layer is received the transmission request of data;
Step (2): the packing data that the medium Access Layer will need to send becomes Frame, and this Frame is made of N subframe, be numbered 0,1 ..., N-1, the duration of each subframe is t, is inserted with the known signal subframe in this N subframe;
Step (3): the medium Access Layer checks Common Control Channel inserts in the signal whether the known signal subframe is arranged, if having, changes step (4), if do not have, changes step (6);
Step (4): the medium Access Layer described known signal subframe of decoding obtains the subframe numbers of this signal;
Step (5): after waiting for (N-SFN) * t, the Frame that is detected finishes, and described Common Control Channel is in the free time, and commentaries on classics step (2) enters once more to be intercepted, and described SFN is the subframe numbers of known signal, and * represents that corresponding element multiplies each other;
Step (6): the user sends Frame.
Described known signal is the synchronization burst of gsm system, described N=M*18, the duration t=120/26ms of described each subframe, the medium Access Layer checks in 7*t Common Control Channel inserts in the signal whether the known signal subframe is arranged in the described step (3), * represent that corresponding element multiplies each other, / expression corresponding element is divided by, and M is a positive integer.
Described known signal is the descending pilot frequency time slot burst structure among TD-SCDMA, described N=M*4, the duration of described each subframe is t=5ms, the medium Access Layer checks in 2*t Common Control Channel inserts in the signal whether the known signal subframe is arranged in the described step (3), * represent that corresponding element multiplies each other, / expression corresponding element is divided by, and M is a positive integer.
Compared with prior art, the invention has the beneficial effects as follows:
Use the method for the invention can carry out carrier sense accurately, and find when channel, be in the free time if being in when doing after can predicting.The inventive method can improve system effectiveness, can reach the effect of power saving simultaneously.
Description of drawings
Fig. 1 is the flow chart of carrier sensing method of the present invention.
Fig. 2 is the frame assumption diagram that the Common Control Channel of the embodiment of the invention one inserts signal A.
Fig. 3 is the detection control channel schematic diagram of the embodiment of the invention one.
Fig. 4 is the frame assumption diagram that the Common Control Channel of the embodiment of the invention two inserts signal B.
Fig. 5 is the TD-SCDMA system burst structure chart of the embodiment of the invention two.
Fig. 6 is the DwPTS burst structure figure of the embodiment of the invention two.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples, but should not limit protection scope of the present invention with this.
Fig. 1 is the flow chart of carrier sensing method of the present invention.In the data frame structure of the present invention definition the known signal of being convenient to detect is arranged, as the S subframe among the embodiment one, detect known signal after, can obtain the information when Frame finishes, i.e. subframe numbers.Each terminal works flow chart is seen Fig. 1 among the present invention.
The carrier sensing method of multi-point access system of the present invention may further comprise the steps:
Step (1): the medium Access Layer is received the transmission request of data;
Step (2): the packing data that the medium Access Layer will need to send becomes Frame, this Frame is made of N subframe, be numbered 0,1 ..., N-1, N and t decide according to the Communication System Design demand, the duration of each subframe is t, is inserted with the known signal subframe in this N subframe;
Step (3): the medium Access Layer repeats to check in the time the longest of known signal Common Control Channel inserts in the signal whether the known signal subframe is arranged, if having, changes step (4), if do not have, changes step (6);
Step (4): the medium Access Layer described known signal subframe of decoding obtains the subframe numbers of this signal;
Step (5): after waiting for (N-SFN) * t, the Frame that is detected finishes, and described Common Control Channel is in the free time, and commentaries on classics step (2) enters once more to be intercepted, and described SFN is the subframe numbers of known signal, and * represents that corresponding element multiplies each other;
Step (6): the user sends Frame.
Embodiment one: common signal channel inserts signal A
Seeing also Fig. 2, is the frame assumption diagram of the Common Control Channel access signal A of the embodiment of the invention one.The every lattice of ground floor are represented gsm wireless subframe, i.e. a 120/26ms among Fig. 2.
F represents the GSM frequency correction burst, i.e. GSM Frequency Correction Burst, and S represents the GSM synchronization burst, i.e. GSM Synchronize Burst, P represents the conventional burst of GSM, i.e. GSM Normal Burst.
The user sends Frame, and once to insert the time that takies common signal channel be M*18*120/26ms, and M can adjust as required, and such as M=26, then once inserting the time that takies common signal channel is 2160MS.
The synchronization burst (synchronize burst abbreviates SB as) that the S subframe is used gsm system carries 25 bits, its some or all bit can be defined as SFN (SubFrame Number subframe numbers), the SFN=1 in first S subframe.
Certain radio station desire is sent out data, could initiate paging in the time of must in 7*120/26ms, detecting less than SB, whether can judge exactly in this way has other radio station to take on the current common signal channel, if other radio station are arranged on the promptly current common signal channel inserting, according to necessarily finding SB in frame structure 7 frames.
If SB is found to have in this radio station in 7*120/26ms, the SB that then decodes obtains SFN, thereby as can be known behind M*18-SFN frame, common signal channel will be in the free time, intercept thereby can enter once more.
Because the training sequence that 64bits is arranged among the SB, has very high auto-correlation peak value, so have a clear superiority in than additive method on the accuracy that detects, the present invention does not limit the method that detects SB, can determine this detection method according to the product of each equipment vendor.
According to above-mentioned frame structure, if common signal channel is occupied, a SB is arranged necessarily in continuous 7 subframes, with reference to Fig. 3, Fig. 3 is the detection control channel schematic diagram of the embodiment of the invention one.Worst condition is that time of beginning to detect is just in the centre of S subframe.
On the contrary, if the common signal channel free time is then necessarily detected less than SB in continuous 7 subframes, so need to detect continuous 7 subframes, promptly 7*120/26ms judges that common signal channel is busy not busy;
If it is busy to detect common signal channel, just detected SB, thereby decode SFN, according to the common signal channel frame structure, inserting each time and taking the common signal channel time is M*18*120/26ms, pass by SFN*120/26ms at present, so can know exactly that common signal channel will be released behind (M*18-SFN) * 120/26ms, therefore, than additive method, this method can improve the efficient that common signal channel service efficiency and terminal take common signal channel, in addition, in time, terminal can be had a rest at (M*18-SFN) * 120/26ms, thereby reaches the effect of power saving.
In sum:
1, for receiving terminal, the SB that Common Control Channel inserts in the signal is a known signal;
2, SB is convenient in detection;
3, carry the information when access finishes among the SB.
Embodiment two: common signal channel inserts signal B
See also Fig. 4～6.Fig. 4 is the frame assumption diagram that the Common Control Channel of the embodiment of the invention two inserts signal B.Fig. 5 is the TD-SCDMA system burst structure chart of the embodiment of the invention two.Fig. 6 is the DwPTS burst structure figure of the embodiment of the invention two.
Among the 3rd layer of Fig. 4, TS0-TS6 represents 7 time slots, all adopts the system burst structure among the TD-SCDMA, length 864chips, DwPTS represents descending pilot frequency time slot, adopts the DwPTS burst structure among the TDS-CDMA, length 96chips, GP represent idle, length 256chips.
In Fig. 4 second layer, every lattice are represented a subframe, duration 5ms.
Once inserting the time that takies common signal channel is M*4*5ms, and M can adjust as required
DwPTS and TS0 send always, the TS1-TS6 free time, comprise the subframe numbers SFN (SubFrame Number) of subframe #4i+3 in the entrained data of 4 TS0 of subframe #4i-#4i+3.
Certain radio station desire is sent out data, must be in two sub-frame times, be to initiate paging when detecting in the 10ms less than DwPTS, because if other accesses are arranged on the common signal channel, whether necessarily have DwPTS in two subframe durations, can judge exactly in this way has other radio station to take on the current common signal channel.
If DwPTS is found to have in this radio station in 10ms, the TS0 that then decodes obtains SFN, thereby as can be known after M*4-SFN subframe, common signal channel will be in the free time, intercept thereby can enter once more.
The DwPTS burst structure has the characteristics of SB among the common signal channel A equally in this variation example:
1, DwPTS is a known signal
2, DwPTS is convenient to detect
3, by detection, can detect SFN, carry the information when this access finishes indirectly DwPTS.
It is described that cumulated volume is invented above embodiment, as can be known
1) in the data frame structure that the present invention uses the known signal of being convenient to detect is arranged, known signal repeats in Frame according to certain rules, and the longest time that repeats is designated as T.
2), can obtain the information when Frame finishes according to the known signal in the Frame.
3) the present invention does not stipulate the known signal of being convenient to detect, and the arrangement in Frame is not stipulated for known signal.
4) the desire terminal of sending out data must not found known signal at T in the time.
5), can obtain the Frame concluding time according to known signal, thereby intercept once more if detect known signal in the terminal T time.
Use the method for the invention can carry out carrier sense accurately, improve the effect that system effectiveness can reach the terminal power saving simultaneously.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (3)
1. the carrier sensing method of a multi-point access system is characterized in that this method may further comprise the steps:
Step (1): the medium Access Layer is received the transmission request of data;
Step (2): the packing data that the medium Access Layer will need to send becomes Frame, this Frame is made of N subframe, be numbered 0,1 ..., N-1, the duration of each subframe is t, be inserted with the known signal subframe in this N subframe, insert promptly that this Frame is made of N subframe after the known signal subframe;
Step (3): the medium Access Layer checks Common Control Channel inserts in the signal whether the known signal subframe is arranged, if having, changes step (4), if do not have, changes step (6);
Step (4): the medium Access Layer described known signal subframe of decoding obtains the subframe numbers of this signal;
Step (5): after waiting for (N-SFN) * t, the Frame that is detected finishes, and described Common Control Channel is in the free time, and commentaries on classics step (2) enters once more to be intercepted, and described SFN is the subframe numbers of known signal, and * represents that corresponding element multiplies each other;
Step (6): the user sends Frame.
2. the carrier sensing method of multi-point access system according to claim 1, it is characterized in that described known signal is the synchronization burst of gsm system, described N=M*18, the duration t=120/26ms of described each subframe, the medium Access Layer checks in 7*t Common Control Channel inserts in the signal whether the known signal subframe is arranged in the described step (3), * represent that corresponding element multiplies each other ,/expression corresponding element is divided by, and M is a positive integer.
3. the carrier sensing method of multi-point access system according to claim 1, it is characterized in that described known signal is the descending pilot frequency time slot burst structure among the TD-SCDMA, described N=M*4, the duration of described each subframe is t=5ms, the medium Access Layer checks in 2*t Common Control Channel inserts in the signal whether the known signal subframe is arranged in the described step (3), * represent that corresponding element multiplies each other ,/expression corresponding element is divided by, and M is a positive integer.
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| CN102300225A (en) * | 2010-06-28 | 2011-12-28 | 华为技术有限公司 | Data transmission detection method and system for short distance wireless social network and relevant equipment |
| BR112016028190A2 (en) * | 2014-06-30 | 2019-06-18 | Huawei Tech Co Ltd | subframe processing method and device |
| JP6780579B2 (en) * | 2017-05-12 | 2020-11-04 | トヨタ自動車株式会社 | Wireless terminal and communication control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038385A (en) * | 1987-10-30 | 1989-12-27 | 菲利浦光灯制造公司 | Controlled csma packet switching system |
| CN1585404A (en) * | 2004-06-04 | 2005-02-23 | 西安电子科技大学 | Distributive competition control of withdraw of radio local network |
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- 2007-08-08 CN CN2007100446703A patent/CN101364853B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038385A (en) * | 1987-10-30 | 1989-12-27 | 菲利浦光灯制造公司 | Controlled csma packet switching system |
| CN1585404A (en) * | 2004-06-04 | 2005-02-23 | 西安电子科技大学 | Distributive competition control of withdraw of radio local network |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-13577A 2007.01.18 |
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Effective date of registration: 20180412 Address after: The 300456 Tianjin FTA test area (Dongjiang Bonded Port) No. 6865 North Road, 1-1-1802-7 financial and trade center of Asia Patentee after: Xinji Lease (Tianjin) Co.,Ltd. Address before: 201203 Shanghai Zhangjiang Zuchongzhi Road No. 1 Lane 2288 Spreadtrum Center Patentee before: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. |
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Application publication date: 20090211 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xinji Lease (Tianjin) Co.,Ltd. Contract record no.: 2018990000196 Denomination of invention: Carrier sensing method for multi-point access system Granted publication date: 20110427 License type: Exclusive License Record date: 20180801 |
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Effective date of registration: 20221017 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 300456 1-1-1802-7, north area of financial and Trade Center, No. 6865, Asia Road, Tianjin pilot free trade zone (Dongjiang Bonded Port Area) Patentee before: Xinji Lease (Tianjin) Co.,Ltd. |