CN101841906A - Method and base station for transmitting frames synchronously - Google Patents
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Abstract
The embodiment of the invention discloses a method and a base station for transmitting frames synchronously. The method comprises the following steps that: the base station adjusts the transmitting time of a downlink subframe of a first TDD system wireless frame, so that the transmitting time aligns with that of a second downlink subframe of the first half of the frame of a second TDD system wireless frame, or the transmitting time lags behind that of the second downlink subframe of the first half of the frame of the second TDD system wireless frame; the base station adjusts the transmitting time of an uplink subframe of the first TDD system wireless frame, so that the transmitting time lags behind that of Gap of a special subframe S of the second half of the frame of the second TDD system wireless frame, wherein the Gap is a protection time interval for the downlink-to-uplink conversion; and the base station transmits the first TDD system wireless frame. Through the method and the base station, two different TDD systems receive and send the frames at the approximately same time so as to reduce the interference between the two TDD systems.
Description
Technical field
The invention belongs to communication technical field, relate in particular to method and base station in different TDD coexistence of systems time frame synchronized transmissions.
Background technology
The LTE system defined simultaneously Frequency Division Duplexing (FDD) (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing, TDD) dual mode.The difference of duplex mode, the most direct is exactly influence for the air interface wireless frame structure, because FDD adopts frequency to distinguish uplink and downlink, its unidirectional resource is continuous in time; And the TDD employing time is distinguished uplink and downlink, and its unidirectional resource is discontinuous in time, and the time interval that needs protection avoid the transmitting-receiving between the both direction to disturb, so LTE is respectively FDD and TDD has designed frame structure separately.The wireless frame structure of TDD system comprises sub-frame of uplink and descending sub frame, leaves the guardtime time slot between sub-frame of uplink and descending sub frame.
When two with cobasis station frequently or between adjacent frequently the TDD system or altogether during hardware, because the frame structure difference of two TDD systems, can cause having serious co-channel interference between two TDD systems, for example, when a system sends, another system may receive, and has influenced the operate as normal between the system thus.Disturb at this at present and also do not have a kind of effectively solution.
Summary of the invention
The embodiment of the invention provides the scheme of a kind of frame synchronization emission, can make the sub-frame of uplink of different TDD systems and descending sub frame receive and send in the roughly the same time by this scheme, thereby has reduced the interference between two TDD systems.
The frame synchronization method for transmitting one that the embodiment of the invention provides may further comprise the steps:
The base station is adjusted into the x time of the descending sub frame of a TDD system wireless frame with the x time of second descending sub frame of the preceding field of the 2nd TDD system wireless frame aligns, or is adjusted into after the x time of second descending sub frame of preceding field of described the 2nd TDD system wireless frame;
The base station is adjusted into the x time of the sub-frame of uplink of a described TDD system wireless frame after the x time of Gap of special subframe S of back field of described the 2nd TDD system wireless frame, described Gap be come downwards to up conversion guard time at interval;
The described TDD system wireless frame of base station.
The frame synchronization method for transmitting two that the embodiment of the invention provides may further comprise the steps:
The base station is adjusted into the x time of the 2nd TDD system wireless frame than a TDD system wireless frame x time hysteresis Δ t ', this Δ t '＜t11 '+t13 '-t21 ';
Described the 2nd TDD system wireless frame of base station;
Described t11 ' is the required duration of descending sub frame of the described TDD system wireless frame of emission;
Described t13 ' is the emission/required duration of receiving conversion interval T TG in the described TDD system wireless frame of emission;
Described t21 ' is first descending sub frame of the preceding field of described the 2nd TDD system wireless frame of emission and the required duration of DwPTS of special subframe S; Wherein, DwPTS is the time slot that is used for descending transmission among the special subframe S.
In addition, embodiments of the invention also provide a kind of base station, are used to launch synchronization frame, and this base station comprises:
Descending sub frame adjusting module 611, be used for x time with the descending sub frame of a TDD system wireless frame and be adjusted into the x time of second descending sub frame of the preceding field of the 2nd TDD system wireless frame and align, or be adjusted into after the x time of second descending sub frame of preceding field of the 2nd TDD system wireless frame;
Sub-frame of uplink adjusting module 612, be used for after the x time of Gap of special subframe S of back field that x time with the sub-frame of uplink of a TDD system wireless frame is adjusted into the 2nd TDD system wireless frame, described Gap be come downwards to up conversion guard time at interval;
Transmitter module is used to launch described through descending sub frame adjusting module and the adjusted TDD system wireless frame of sub-frame of uplink adjusting module.
The embodiment of the invention also provides another base station, and this base station comprises:
Adjusting module is used for the base station x time of the 2nd TDD system wireless frame is adjusted into than a TDD system wireless frame x time hysteresis Δ t ', this Δ t '＜t11 '+t13 '-t21 ';
Described t11 ' is the required duration of descending sub frame of emission the one TDD system wireless frame;
Described t13 ' is the required duration of emission TTG, and described TTG is the emission/receiving conversion interval in the TDD system wireless frame;
Described t21 ' is first descending sub frame of the preceding field of emission the 2nd TDD system wireless frame and the required duration of DwPTS of special subframe S, and described DwPTS is the time slot that is used for descending transmission among the special subframe S;
Transmitter module is used to launch the 2nd TDD system wireless frame after described adjusting module is adjusted x time.
The method and the base station that provide by the invention described above embodiment, can make the sub-frame of uplink of two different TDD systems and the x time of descending sub frame be in the roughly state of alignment respectively, two different TDD systems can receive and transmit frame in the roughly the same time thus, thereby had reduced the interference between two TDD systems.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method embodiment one;
Fig. 2 is the schematic flow sheet of the inventive method embodiment two;
Fig. 3 is the structural representation of TDD LTE radio frames in the prior art;
Fig. 4 is the structural representation of the special subframe S of TDD LTE radio frames in the prior art;
Fig. 5 is the structural representation of WIMAX radio frames in the prior art;
Fig. 6 is embodiment of the invention WIMAX radio frames and TDD LTE radio frames alignment thereof schematic diagram;
Fig. 7 is embodiment of the invention TDD LTE radio frames and WIMAX radio frames alignment thereof schematic diagram;
Fig. 8 is a kind of architecture of base station schematic diagram of the embodiment of the invention;
Fig. 9 is the another kind of architecture of base station schematic diagram of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of scheme of frame synchronization emission, for the different TDD system of the frame length of two radio frames, if the frame length of the radio frames of a TDD system is less than the frame length of the radio frames of the 2nd TDD system, then the x time of the radio frames of the TDD system that adjusts both can have been passed through in the base station, the sub-frame of uplink of radio frames of two TDD systems and the x time of descending sub frame roughly alignd, reduced the interference between two TDD systems thus.
Referring to shown in Figure 1, be the embodiment of the invention one, the method that the base station is adjusted the x time of the radio frames of a TDD system, this method comprises the steps:
Step 101: the base station is adjusted into the x time of the descending sub frame of a TDD system wireless frame with the x time of second descending sub frame of the preceding field of the 2nd TDD system wireless frame aligns, or is adjusted into after the x time of second descending sub frame of preceding field of described the 2nd TDD system wireless frame;
Step 102: the base station is adjusted into the x time of the sub-frame of uplink of a described TDD system wireless frame after the x time of Gap of special subframe S of back field of described the 2nd TDD system wireless frame, described Gap be come downwards to up conversion guard time at interval;
Step 103: the TDD system wireless frame behind the above-mentioned adjustment x time of base station.
Referring to shown in Figure 2, be the embodiment of the invention two, the method that the base station is adjusted the x time of the radio frames of the 2nd TDD system, this method comprises the steps:
Step 201: the base station is adjusted into the x time of the 2nd TDD system wireless frame than a TDD system wireless frame x time hysteresis Δ t ', this Δ t '＜t11 '+t13 '-t21 ';
Step 202: the 2nd TDD system wireless frame behind the above-mentioned adjustment x time of base station;
Described t11 ' is the required duration of descending sub frame of the described TDD system wireless frame of emission;
Described t13 ' is the emission/required duration of receiving conversion interval T TG in the described TDD system wireless frame of emission;
Described t21 ' is first descending sub frame of the preceding field of described the 2nd TDD system wireless frame of emission and the required duration of DwPTS of special subframe S; Wherein, DwPTS is the time slot that is used for descending transmission among the special subframe S.
The scheme of describing by above-mentioned two embodiment all can make different TDD systems receive and send radio frames in the roughly the same time, reduced the interference between two TDD systems thus.
Below with WiMAX (Worldwide Interoperability for Microwave Access) system and TDD LTE (Long Time evolution) coexistence of systems, promptly a TDD system is the WiMAX system, and the 2nd TDD system is that to be example describe the technical scheme of the embodiment of the invention situation of TDD LTE system.
Referring to shown in Figure 3, be the structure of the radio frames of TDD LTE system, each 10ms radio frames comprises that 2 length are the field of 5ms, each field is made up of 4 data subframes (as descending subframe D and sub-frame of uplink U) and 1 special subframe S, as shown in Figure 4.Special subframe S comprises 3 special time slot: DwPTS, and Gap and UpPTS, total length are 1ms.Wherein DwPTS is used for descending transmission all the time, and UpPTS is used for up transmission all the time, and Gap as the guard time that comes downwards to up conversion at interval.The length of DwPTS and UpPTS is configurable, and the length of DwPTS is 3～12 OFDM symbols, and the length of UpPTS is 1～2 OFDM symbol, and corresponding Gap length is 1～10 OFDM symbol.
Referring to shown in Figure 5, be the structure of the radio frames of WIMAX system, each 5ms radio frames comprises a descending sub frame D, sub-frame of uplink U, emission/receiving conversion (TTG) and a reception/emission transfer interval (RTG) at interval.The sub-frame of uplink U of WIMAX radio frames and descending sub frame D ratio can be adjusted.
When TDD LTE system and WIMAX coexistence of systems, for fear of the co-channel interference between two systems, the base station will be adjusted the x time of the frame of one of them system, the x time of adjusting the radio frames of WIMAX system with the base station is an example below, and the method for the embodiment of the invention is described.
For convenience of description, the radio frames with the WIMAX system is called frame (1) below, and the radio frames of TDD LTE system is called frame (2).The base station is adjusted the x time of the radio frames of WIMAX system as follows.
Step 301: the base station is adjusted into the x time of the descending sub frame in the frame (1) of WIMAX system with the x time of second descending sub frame of the preceding field of the frame (2) of TDD LTE system aligns, or is adjusted into after the x time of second descending sub frame of preceding field of frame (2);
If the base station is a dual-mode base station; then WIMAX system and TDD LTE system use same clock; if TDD LTE system is the system that formerly sets up; then the base station can detect the x time of the frame (2) of TDD LTE system, according to the x time of frame (2) x time of frame (1) is adjusted then.
If two systems use different base stations, then the base station of WIMAX system can obtain the x time of the frame (2) of TDD LTE system by the monitoring idle message, according to the x time of frame (2) x time of the frame (1) of WIMAX system is adjusted then.
Step 302: the base station is adjusted into the x time of the sub-frame of uplink in the frame (1) after the x time of Gap of special subframe S of back field of frame (2);
As shown in Figure 6, suppose that the required duration of descending sub frame of frame emission (1) is t11, the sub-frame of uplink of frame emission (1) and the required duration of RTG are t12, and the required duration of emission TTG is t13.First descending sub frame of second descending sub frame of the preceding field of frame emission (2), frame (2) back field and the required duration of DwPTS of special subframe S are t21, the required duration of sub-frame of uplink of emission UpPTS and frame (2) back field is t22, and the required duration of Gap of emission special subframe S is t23.
For the WIMAX system is alignd with the sub-frame of uplink of TDD LTE system and the x time of descending sub frame, above-mentioned steps 301 and step 302 can further satisfy following two conditions when adjusting the x time of frame (1):
Condition 1:t11＜t21+t23;
Condition 2:t12＜t22+t23.
For two interference between the TDD system are further reduced, the base station can be adjusted the sub-frame of uplink of frame (1) and frame (2) and the x time of descending sub frame more consistent, for example, the base station is when adjusting the x time of frame (1), except satisfying top two conditions, can also further satisfy following condition:
Condition 3:t21＜t11+t13;
Condition 4:t22＜t12+t13.
Step 303: the above-mentioned frame of base station (1).
In order to simplify the operation, the base station can postpone Δ t frame emission (1) again at frame emission (2) afterwards in actual applications.For example, can be set to 4ms by Δ t.And in order to satisfy above-mentioned four conditions, preferably the ratio that the sub-frame of uplink U and the descending sub frame D of above-mentioned frame (1) can be taken time slot is adjusted into 27: 20 or 26: 21.
Method by the foregoing description one description, can make TDD LTE system be in the state that roughly aligns respectively with the sub-frame of uplink of WIMAX system and the x time of descending sub frame, TDD LTE system and WIMAX system can receive and transmit frame in roughly the same time, reduced the interference between two TDD systems thus.
The foregoing description has been described the situation according to the x time of the radio frames of the x time adjustment WIMAX system of the radio frames of TDD LTE system.The x time of adjusting the radio frames of TDD LTE system with the base station is an example below, and the method for the embodiment of the invention is further specified.For convenience of description, frame that below will the WIMAX system is called frame (1), and the frame of TDD LTE system is called frame (2).The base station is adjusted the x time of the frame of TDD LTE system as follows.
As shown in Figure 7, suppose that the required duration of descending sub frame of frame emission (1) is t11 ', the sub-frame of uplink of frame emission (1) and the required duration of RTG are t12 ', and the required duration of emission TTG is t13 '.First descending sub frame of the preceding field of frame emission (2) and the required duration of DwPTS of special subframe S are t21 ', and the required duration of sub-frame of uplink of emission UpPTS and the preceding field of frame (2) is t22 ', and the required duration of Gap of emission special subframe S is t23 '.
Step 401: the base station is adjusted into frame (1) x time hysteresis Δ t ' than WIMAX system, this Δ t '＜t11 '+t13 '-t21 ' with the x time of the frame (2) of TDD LTE system.
If the base station is a dual-mode base station; then TDD LTE system and WIMAX system use same clock; if the WIMAX system is the system that formerly sets up; then the base station can detect the x time of the frame (1) of WIMAX system, according to the x time of frame (1) x time of frame (2) is adjusted then.
If two systems use different base stations, then the base station of TDD LTE system can obtain the x time of the frame (1) of WIMAX system by the monitoring idle message, according to the x time of frame (1) x time of the frame (2) of TDD LTE system is adjusted then.
For two interference between the TDD system are further reduced, the base station can be adjusted the sub-frame of uplink of frame (2) and frame (1) and the x time of descending sub frame more consistent, for example, the base station is when adjusting the x time of frame (2), except satisfying top two conditions, can also further satisfy following condition:
Condition 2:t22 '＜t12 '+t13 '.
Condition 3:t11 '＜t21 '+t23 '+Δ t ';
Condition 4:t12 '＜t22 '+t23 '.
In actual applications, Δ t ' can be set to 1ms.And in order to satisfy above-mentioned four conditions, preferably the ratio that the sub-frame of uplink U and the descending sub frame D of above-mentioned frame (1) can be taken time slot is adjusted into 27: 20 or 26: 21.
Step 402: the above-mentioned frame of base station (2).
Except the method that the invention described above embodiment provides, the embodiment of the invention also provides a kind of base station, and referring to shown in Figure 8, this base station comprises:
Descending sub frame adjusting module 811, be used for x time with the descending sub frame of the frame (1) of WIMAX system and be adjusted into the x time of second descending sub frame of the preceding field of the frame (2) of TDD LTE system and align, or be adjusted into after the x time of second descending sub frame of preceding field of frame (2);
Sub-frame of uplink adjusting module 812 is used for after the x time of Gap of special subframe S of back field that x time with the sub-frame of uplink of frame (1) is adjusted into frame (2);
Embodiments of the invention also provide another base station, and referring to shown in Figure 9, this base station comprises:
Adjusting module 911 is used for the base station x time of the frame (2) of TDD LTE system is adjusted into frame (1) x time hysteresis Δ t ' than WIMAX system, this Δ t '＜t11 '+t13 '-t21 '; T11 ' is the required duration of descending sub frame of frame emission (1), and t13 ' is the required duration of emission TTG, and t21 ' is first descending sub frame of the preceding field of frame emission (2) and the required duration of DwPTS of special subframe S.
The x time of the x time of radio frames that above-mentioned base station can be by adjusting the WIMAX system or the radio frames of TDD LTE system, make the different TDD systems to receive and to send, thereby reduced the interference between two TDD systems in roughly the same time.
The all or part of step that one of ordinary skill in the art will appreciate that the execution of realization said method embodiment or base station can instruct relevant hardware to finish by program.
The technical scheme that provides by the invention described above, can make TDD LTE system be in the state that roughly aligns respectively with the sub-frame of uplink of WIMAX system and the x time of descending sub frame, TDDLTE system and WIMAX system can receive and transmit frame in roughly the same time thus, thereby had reduced the interference between two TDD systems.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a frame synchronization method for transmitting is characterized in that, described method comprises:
The base station is adjusted into the x time of the descending sub frame of a TDD system wireless frame with the x time of second descending sub frame of the preceding field of the 2nd TDD system wireless frame aligns, or is adjusted into after the x time of second descending sub frame of preceding field of described the 2nd TDD system wireless frame;
The base station is adjusted into the x time of the sub-frame of uplink of a described TDD system wireless frame after the x time of Gap of special subframe S of back field of described the 2nd TDD system wireless frame, described Gap be come downwards to up conversion guard time at interval;
The described TDD system wireless frame of base station.
2. method according to claim 1 is characterized in that, following condition is satisfied in described base station at the x time of the sub-frame of uplink of adjusting a TDD system wireless frame or when adjusting the x time of descending sub frame:
T11＜t21+t23; And t12＜t22+t23;
Described t11 is the required duration of descending sub frame of the described TDD system wireless frame of emission;
Described t21 for described the 2nd TDD system wireless frame of emission before the required duration of DwPTS of special subframe S in first descending sub frame of field and the 2nd TDD system wireless frame behind second descending sub frame, described the 2nd TDD system wireless frame of field, described DwPTS is the time slot that is used for descending transmission among the special subframe S;
Described t23 is the required duration of Gap of the described special subframe S of emission;
Described t12 is the sub-frame of uplink and the required duration of RTG of emission the one TDD system wireless frame, and described RTG is the reception/emission transfer interval in the TDD system wireless frame;
Described t22 is the required duration of sub-frame of uplink of field behind emission UpPTS and the 2nd TDD system wireless frame, and described UpPTS is the time slot that is used for up transmission among the special subframe S.
3. method according to claim 2 is characterized in that, described base station is further satisfied following condition: t21＜t11+t13 constantly the time at the x time of sub-frame of uplink that adjust to adjust a TDD system wireless frame or when adjusting the emission of descending sub frame; And t22＜t12+t13; Described t13 is the required duration of emission TTG, and described TTG is the emission/receiving conversion interval in the TDD system wireless frame.
4. according to any described method of claim 1 to 3, it is characterized in that the x time that the descending sub frame of a described TDD system wireless frame is adjusted in the base station further comprises before: the sub-frame of uplink of a described TDD system wireless frame and the ratio that takies time slot of descending sub frame are adjusted into 27: 20 or 26: 21.
5. according to any described method of claim 1 to 3, it is characterized in that a described TDD system is the WIMAX system, described the 2nd TDD system is a TDD LTE system.
6. a frame synchronization method for transmitting is characterized in that, described method comprises:
The base station is adjusted into the x time of the 2nd TDD system wireless frame than a TDD system wireless frame x time hysteresis Δ t ', this Δ t '＜t11 '+t13 '-t21 ';
Described the 2nd TDD system wireless frame of base station;
Described t11 ' is the required duration of descending sub frame of the described TDD system wireless frame of emission;
Described t13 ' is the emission/required duration of receiving conversion interval T TG in the described TDD system wireless frame of emission;
Described t21 ' is first descending sub frame of the preceding field of described the 2nd TDD system wireless frame of emission and the required duration of DwPTS of special subframe S; Wherein, DwPTS is the time slot that is used for descending transmission among the special subframe S.
7. method according to claim 6 is characterized in that described base station further satisfies following condition when adjusting the x time of the 2nd TDD system wireless frame:
T22 '＜t12 '+t13 '; And t11 '＜t21 '+t23 '+Δ t '; And t12 '＜t22 '+t23 ';
Described t22 ' is the required duration of sub-frame of uplink of emission UpPTS and the preceding field of the 2nd TDD system wireless frame, and described UpPTS is the time slot that is used for up transmission among the special subframe S;
Described t12 ' is the sub-frame of uplink and the required duration of RTG of emission the one TDD system wireless frame, and described RTG is the reception/emission transfer interval in the TDD system wireless frame;
Described t23 ' is the required duration of Gap of emission special subframe S, and described Gap is the guard time interval that comes downwards to up conversion.
8. method according to claim 6 is characterized in that, described Δ t ' is 1 millisecond.
9. according to any described method of claim 6 to 8, it is characterized in that the base station further comprises before adjusting the x time of descending sub frame of described the 2nd TDD system wireless frame: the ratio that the sub-frame of uplink and the descending sub frame of a described TDD system wireless frame taken time slot is adjusted into 27: 20 or 26: 21.
10. according to any described method of claim 6 to 8, it is characterized in that a described TDD system is the WIMAX system, described the 2nd TDD system is a TDD LTE system.
11. a base station is characterized in that, described base station comprises:
Descending sub frame adjusting module 611, be used for x time with the descending sub frame of a TDD system wireless frame and be adjusted into the x time of second descending sub frame of the preceding field of the 2nd TDD system wireless frame and align, or be adjusted into after the x time of second descending sub frame of preceding field of the 2nd TDD system wireless frame;
Sub-frame of uplink adjusting module 612, be used for after the x time of Gap of special subframe S of back field that x time with the sub-frame of uplink of a TDD system wireless frame is adjusted into the 2nd TDD system wireless frame, described Gap be come downwards to up conversion guard time at interval;
Transmitter module is used to launch described through descending sub frame adjusting module and the adjusted TDD system wireless frame of sub-frame of uplink adjusting module.
12. base station according to claim 11 is characterized in that, a described TDD system is the WIMAX system, and described the 2nd TDD system is a TDD LTE system.
13. a base station is characterized in that, described base station comprises:
Adjusting module is used for the base station x time of the 2nd TDD system wireless frame of TDD LTE system is adjusted into a TDD system wireless frame x time hysteresis Δ t ' than WIMAX system, described Δ t '＜t11 '+t13 '-t21 ';
Described t11 ' is the required duration of descending sub frame of emission the one TDD system wireless frame the one TDD system wireless frame;
Described t13 ' is the required duration of emission TTG, and described TTG is the emission/receiving conversion interval in a TDD system wireless frame the one TDD system wireless frame;
Described t21 ' is first descending sub frame of the preceding field of emission the 2nd TDD system wireless frame and the required duration of DwPTS of special subframe S, and described DwPTS is the time slot that is used for descending transmission among the special subframe S;
Transmitter module is used to launch the 2nd TDD system wireless frame after described adjusting module is adjusted x time.
14. base station according to claim 13 is characterized in that, a described TDD system is the WIMAX system, and described the 2nd TDD system is a TDD LTE system.
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| CN102404841A (en) * | 2011-10-27 | 2012-04-04 | 华为技术有限公司 | Implementation method and equipment for synchronization between heterogeneous systems |
| WO2012109833A1 (en) * | 2011-02-17 | 2012-08-23 | 中兴通讯股份有限公司 | Method and apparatus for processing baseband uplink and downlink sub-frames |
| WO2012163193A1 (en) * | 2011-05-31 | 2012-12-06 | 华为技术有限公司 | Data transmission method and device |
| WO2013107304A1 (en) * | 2012-01-18 | 2013-07-25 | 华为技术有限公司 | Method, base station and system for synchronizing lte-tdd network and wimax network |
| WO2015096286A1 (en) * | 2013-12-25 | 2015-07-02 | 华为技术有限公司 | Half-duplex frequency-division duplex communication method, base station, and terminal |
| WO2019014865A1 (en) * | 2017-07-19 | 2019-01-24 | 北京小米移动软件有限公司 | Information transmission method and device |
| CN110034912A (en) * | 2015-01-26 | 2019-07-19 | 华为技术有限公司 | Data transmission method and equipment |
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| CN1960207A (en) * | 2005-11-01 | 2007-05-09 | 华为技术有限公司 | Radio transfer communication system and method based on admixture of FDD and TDD |
| US20080144612A1 (en) * | 2006-12-13 | 2008-06-19 | Nokia Corporation | Flexible radio resource sharing in time and frequency domains among TDD communication systems |
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