CN101141155B - Method of preventing coexisted interference of PHS and TD-SCDMA - Google Patents
Method of preventing coexisted interference of PHS and TD-SCDMA Download PDFInfo
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- CN101141155B CN101141155B CN2006101281953A CN200610128195A CN101141155B CN 101141155 B CN101141155 B CN 101141155B CN 2006101281953 A CN2006101281953 A CN 2006101281953A CN 200610128195 A CN200610128195 A CN 200610128195A CN 101141155 B CN101141155 B CN 101141155B
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Abstract
The present invention provides a method to avoid interference due to coexistence of PHS and TD-SCDMA system, which comprises steps below: Setting frame offset Frame_Offset of PHS and TD-SCDMA system to ensure Frame_Offset is not less than 1.4 ms but not more than 2.025 ms. More preferentially, the frame offset Frame_Offset is not less than 1.675 ms but not more than 1.750 ms.
Description
Technical field
The present invention relates to evade the method for PHS and the interference of TD-SCDMA coexistence of systems.
Background technology
The working frequency range of TD-SCDMA is 1880-1920MHz and 2010-2025MHz, and the PHS system works is in 1900MHz～1920MHz frequency range.In the 1900MHz frequency range,, therefore may there be the mutual interference problem of TD-SCDMA and PHS because TD-SCDMA and PHS are in successive bands.Though TD-SCDMA and PHS system belong to the TDD system, subframe has identical length simultaneously, because the difference of frame structure has caused diversity and the uncertainty of TD-SCDMA to the PHS interference type.
If do not take corresponding workaround, the interference of the above-mentioned type will produce two systematic functions and comparatively seriously influence, even can cause the part system to be tending towards paralysis.In order to guarantee that two systems can adjacent frequency coexistence, can adopt conventional bypassing method, for example: the frequency isolation band is set, addition of base station transmits and receives methods such as filter and site engineering, but these conventional methods also will strengthen the difficulty of coordinating between the different system operator when cost and complexity are evaded in increase greatly.
Summary of the invention
For addressing the above problem, the invention provides the method that a kind of PHS of evading and TD-SCDMA coexistence of systems disturb, comprising: the frame offset time Frame_Offset of PHS and TD-SCDMA system is set, makes 1.4ms≤Frame_Offset≤2.025ms.
Preferably, frame offset time Frame_Offset satisfies: 1.675ms≤Frame_Offset≤2.025ms.
Preferably, frame offset time Frame_Offset satisfies: 1.4ms≤Frame_Offset≤1.750ms.
More preferably, frame offset time Frame_Offset satisfies: 1.675ms≤Frame_Offset≤1.750ms.
Description of drawings
Fig. 1 is the schematic diagram of the frame structure of TD-SCDMA and PHS.
Fig. 2 is the schematic diagram of PHS and TD-SCDMA frame offset time.
Fig. 3 evades the schematic diagram of PHS to the frame offset time setting of TD-SCDMA system interference.
Fig. 4 evades the schematic diagram of TD-SCDMA to the frame offset time setting of PHS system interference.
Embodiment
Introduce the specific embodiment of the present invention below in conjunction with accompanying drawing.
The frame structure of TD-SCDMA and PHS as shown in Figure 1, wherein the length of each time slot of PHS frame all is 625 μ s, the length of the TS0 of TD-SCDMA frame, TS1, TS2, TS3, TS4, TS5, TS6 and TS7 time slot is 675 μ s, D
wThe length of PTS time slot is 75 μ s, and the length of GP time slot is 75 μ s, U
pThe length of PTS time slot is 125 μ s.
Consider that current PHS system and TD-SCDMA system all adopt the GPS mode to realize that the whole network is synchronous, the PHS system is mature on the whole and is used in a large number, and it is bigger that its frame synchronization mechanism is transformed difficulty.But for the TD-SCDMA system that works in 1880MHz～1900MHz, still be in development at present, still there is bigger time and space in its extensive use, make the transformation of frame synchronization mechanism have possibility, thereby disturb for evade PHS and TD-SCDMA coexistence of systems by the method that the frame offset time is set, possibility is provided.
Calculate and Mote Carlo method of emulation by certainty, the 1900MHz frequency range of PHS and TD-SCDMA coexistence has been carried out the research back to be found: the TD-SCDMA base station is to PHS CS (base station), and promptly there be certain interference in the descending time slot of TD-SCDMA to the ascending time slot of PHS; PHS CS is to the TD-SCDMA base station, and promptly there is certain interference in the PHS descending time slot to the TD-SCDMA ascending time slot.
By reducing above-mentioned two kinds of interference, can evade PHS and TD-SCDMA coexistence of systems and disturb.
Below be reference point with the single frames of PHS system, definition Frame_Offset is that the frame offset time of PHS and TD-SCDMA system is Frame_Offset, as shown in Figure 2.
At first introduce and evade the method for PHS the frame offset time setting of TD-SCDMA system interference.
For PHS the adjacent of TD-SCDMA system disturbed frequently, according to coexistence The Study of Interference conclusion: the PHS base station exists necessarily TD-SCDMA base station (that is: the PHS descending time slot is to the TD-SCDMA ascending time slot) disturbs, and need take corresponding workaround; And the PHS base station is less to the interference of TD-SCDMA base station and terminal (that is: the PHS ascending time slot is to TD-SCDMA uplink and downlink time slot) to TD-SCDMA terminal (that is: the PHS descending time slot is to the TD-SCDMA descending time slot) and phs terminal, can not take workaround.
Shown in Fig. 3 (a) and Fig. 3 (b), corresponding to the PHS descending time slot TD-SCDMA ascending time slot is not existed the largest frames offset time and the minimum frame offset time of interference, be respectively Frame_Offset_Min=1.675ms and Frame_Offset_Max=2.025ms.
Secondly introduce and evade the frame offset time setting of TD-SCDMA the PHS system interference
For TD-SCDMA the adjacent of PHS system disturbed frequently, according to coexistence The Study of Interference conclusion: the TD-SCDMA base station exists necessarily PHS base station (that is: the TD-SCDMA descending time slot is to the PHS ascending time slot) disturbs, and need take corresponding workaround; According to the difference in TD-SCDMA base station interference source, compare with the TS0+DwPTS time slot, descending time slot TS4～TS5 is little to the interference of PHS base station, evades cost accordingly and also can reduce; And the TD-SCDMA base station is less to the interference of phs terminal and base station (that is: TD-SCDMA descending time slot to PHS descending and ascending time slot) to phs terminal (that is: the TD-SCDMA descending time slot is to the PHS descending time slot) and TD-SCDMA terminal, can not take workaround.
For TD-SCDMA the coexistence of PHS system is disturbed, owing to there is not the frame offset time interval that does not have TD-SCDMA that PHS is disturbed fully, consider that herein a TD-SCDMA downlink business time slot (that is: TS4 time slot) only acts on the situation of an ascending time slot of PHS, just the TD-SCDMA base station is to the situation of PHS system interference minimum.Shown in Fig. 4 (a) and Fig. 4 (b),, be respectively Frame_Offset_Min=1.4ms and Frame_Offset_Max=1.750ms corresponding to the largest frames offset time and the minimum frame offset time of TD-SCDMA to the PHS least interference.
Introduce the method for the frame offset time setting of evading TD-SCDMA and PHS dual system coexistence interference below.
Disturb minimum principle each other according to PHS and TD-SCDMA system, obtain between frame offset time setting area separately respectively after.When the frame offset time get the two the union interval (that is, and during 1.4ms≤Frame_Offset≤2.025ms), can play to a certain extent evade TD-SCDMA and PHS dual system coexistence effects of jamming.When the frame offset time get the two the common factor interval (when being 1.4ms≤Frame_Offset≤2.025ms), better effects if.
After being provided with according to above-mentioned frame offset time, the coexistence between PHS and the TD-SCDMA system is disturbed and will be reduced.Under the situation of the best, will there be interference in PHS to the TD-SCDMA system, the interference that TD-SCDMA exists a downlink business time slot to produce at most to the PHS system, and the interference that does not exist serious relatively control time slot TS0 to produce is evaded cost accordingly and will be reduced greatly.
Claims (4)
1. evade the method that PHS and TD-SCDMA coexistence of systems disturb for one kind, comprising:
The frame offset time of PHS and TD-SCDMA system is set, makes 1.4ms≤frame offset time≤2.025ms.
2. the method for claim 1, wherein the frame offset time satisfies 1.675ms≤frame offset time≤2.025ms.
3. the method for claim 1, wherein the frame offset time satisfies 1.4ms≤frame offset time≤1.750ms.
4. method as claimed in claim 2, wherein the frame offset time satisfies 1.675ms≤frame offset time≤1.750ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101281953A CN101141155B (en) | 2006-09-06 | 2006-09-06 | Method of preventing coexisted interference of PHS and TD-SCDMA |
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| CN2006101281953A CN101141155B (en) | 2006-09-06 | 2006-09-06 | Method of preventing coexisted interference of PHS and TD-SCDMA |
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| Publication Number | Publication Date |
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| CN101141155A CN101141155A (en) | 2008-03-12 |
| CN101141155B true CN101141155B (en) | 2011-11-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8838046B2 (en) | 2010-06-18 | 2014-09-16 | Mediatek Inc. | System and method of hybrid FDM/TDM coexistence interference avoidance |
| CN106411350A (en) | 2010-06-18 | 2017-02-15 | 联发科技股份有限公司 | System and method for coordinating multiple radio transceivers |
| CN102378299B (en) * | 2010-08-10 | 2015-03-11 | 电信科学技术研究院 | Measurement reporting method and device for avoiding coexisting interference in equipment |
| US8737924B2 (en) | 2010-08-12 | 2014-05-27 | Mediatek Inc. | Method to trigger in-device coexistence interference mitigation in mobile cellular systems |
| US8780880B2 (en) | 2010-10-01 | 2014-07-15 | Mediatek Singapore Pte, Ltd. | Method of TDM in-device coexistence interference avoidance |
| KR101803019B1 (en) | 2011-01-07 | 2017-12-01 | 주식회사 골드피크이노베이션즈 | Apparatus and method for coordinating in-device coexistence interference in wireless communication system |
| CN102638809A (en) * | 2011-02-15 | 2012-08-15 | 北京博创讯达通信技术有限责任公司 | Simulation method for interference coexistence of mobile communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1486578A (en) * | 2001-01-12 | 2004-03-31 | �ƶ��Ѷ��� | A collision free access scheduling in cellular TDMA-CDMA networks |
| CN1798118A (en) * | 2004-12-24 | 2006-07-05 | 展讯通信（上海）有限公司 | Method for estimating frequency deviation accurately in TD-SCDMA |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1486578A (en) * | 2001-01-12 | 2004-03-31 | �ƶ��Ѷ��� | A collision free access scheduling in cellular TDMA-CDMA networks |
| CN1798118A (en) * | 2004-12-24 | 2006-07-05 | 展讯通信（上海）有限公司 | Method for estimating frequency deviation accurately in TD-SCDMA |
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