CN101431808A - Coexisting method and device of TDD system - Google Patents
Coexisting method and device of TDD system Download PDFInfo
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Abstract
The embodiment of the invention discloses a concomitant method and device of a time duplex system, which is used for achieving the concomitance of a first time duplex system and a second time duplex system. The concomitant method comprises: distributing the ratio information according to the radio frame gap in the first time duplex system and the second time duplex system, and confirming the distributing period by one radio frame, the service sub frame of the radio sub frame in the first time duplex system and the distributing way of the special area; according to the second frame of the TDD system timing information, the second time division duplex wireless system frame based on the initial moment of time, set the time offset for the first time division duplex system, the relative timing of the base frame of the partial moments shift. Cases the implementation of the invention also provides a base station.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of symbiont techn of tdd systems.
Background technology
3-G (Generation Three mobile communication system) (The 3rd Generation Mobile Communication, 3G) adopted code division multiple access access (Code Division Multiple Access, CDMA) technology is supported multimedia service, will have higher competitiveness in several years of future.(TimeDivision Duplex, TDD) CDMA of mode comprises TD-CDMA (Time Division CDMA) and two kinds of standards of TD-SCDMA (Time Division-Synchronous CDMA) to time division duplex.(International Telecommunication Union, ITU) standard claims that TD-CDMA is that (TD-SCDMA is low spreading rate (Low ChipsRate, LCR) TDD to high spreading rate for High Chips Rate, HCR) TDD in International Telecommunications Union.
TD-SCDMA is the standard of unique support TDD mode in three kinds of international standards of 3G system.TD-SCDMA supports the transmission of up-downgoing non-symmetrical service, has bigger flexibility on spectrum utilization.The existing at present part commercial network of TD-CDMA, its frame structure as shown in Figure 1, a 10ms radio frames (Frame) is divided into 15 time slots, the length of each time slot is 666.66us, each time slot can be assigned as uplink or downlink transfer, the time slot that is assigned as uplink is called ascending time slot, and the time slot that is assigned as downlink transfer is called descending time slot.Have a descending time slot and an ascending time slot in the 10ms radio frames at least.
(3rd Generation Partnership Project 3GPP) has started Long Term Evolution (Long Term Evolution, standardization effort LTE) in 3G (Third Generation) Moblie standardization body.(its subcarrier spacing is set at 15kHz for Orthogonal Frequency Division Multiplex, OFDM) technology, and corresponding OFDM symbol lengths is 66.67us based on OFDM in the LTE system.For guarantee with the 3G system in unique TD-SCDMA standard coexistence based on the TDD mode; LTE TDD system has adopted frame structure as shown in Figure 2: a 10ms radio frames is made up of two 5ms fields; each field is by business time-slot (the Time Slot of 8 0.5ms; TS) and three special areas form, three special areas are respectively: descending pilot frequency time slot (DwPTS), come downwards to up protection interval (GP) and uplink pilot time slot (UpPTS).Two continuous business time-slots are formed a service subframe, and (Sub-Frame, SF), the length of each service subframe is 1ms.The length of three special areas can be by the high-level signaling flexible configuration, but total length keeps 1ms constant.Comprise 4 service subframe in each field, service subframe #0 always is assigned as the transmission downlink business.Each field disposes a pair of time slot switching point, wherein come downwards to the ascending time slot switching point and be positioned at special area GP, go upward to the descending time slot switching point and be positioned at other service subframe boundary except that service subframe #0, two business time-slots of same service subframe can not carry out up-downgoing and switch.The parameter of business time-slot is provided by table 1 in the frame structure of LTETDD system, and (Cyclic Prefix, length CP) is determined the OFDM symbolic number that comprises in the business time-slot according to the Cyclic Prefix of OFDM symbol.
Table 1
The compatibility with the TD-SCDMA system has only been considered in the frame structure of LTE TDD system design in the prior art, LTE TDD system can realize the coexistence with the TD-SCDMA system, but the design of the frame structure of LTE TDD system does not have the compatibility of consideration and TD-CDMA system.In the zone of having disposed the TD-CDMA network, when needing to dispose LTE TDD network, can produce serious inter-system interference between TD-CDMA system and the LTETDD system, cause two systems all can't operate as normal.
As shown in Figure 3, exist at the same time under the situation of TD-CDMA system and LTE TDD system,, can make the radio frames of two systems have the coincidence zone of ascending time slot and descending time slot because compatibility is not considered in the design of frame structure, be called interference region, cause serious inter-system interference.For example in certain interference region, the TD-CDMA system sends downlink data, and LTE TDD system receives upstream data simultaneously, the LTETDD system may receive the downlink data that the TD-CDMA system sends in certain time slot, and the LTETDD system handles this downlink data as the upstream data that native system need receive, and causes the TD-CDMA system that LTE TDD system is formed strong jamming; If opposite in certain interference region, LTE TDD system sends downlink data, and the TD-CDMA system receives upstream data simultaneously, can cause LTE TDD system that the TD-CDMA system is formed strong jamming.Because overlapping the interference that produces, ascending time slot and descending time slot make that two systems all can't operate as normal in the radio frames of two TDD systems.
Summary of the invention
The embodiment of the invention provides a kind of coexistence method and device of tdd systems, in order to realize the coexistence of first tdd systems and second tdd systems.
The embodiment of the invention provides a kind of coexistence method of tdd systems, comprising:
According to second tdd systems of first tdd systems coexistence in the time slot allocation percent information of radio frames, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the service subframe of radio frames and the configuration mode of special area in described first tdd systems, and in described first tdd systems initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems;
Dispose uplink service subframe, downlink business subframe and the special area of radio frames in described first tdd systems according to described configuration mode, and according to the frame timing information of described second tdd systems, the initial moment with radio frames in described second tdd systems is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of first tdd systems that described time offset is set.
The embodiment of the invention provides a kind of coexisting apparatus of tdd systems, comprising:
The coexistence determining unit: be used for according to the time slot allocation percent information of the second tdd systems radio frames of first tdd systems coexistence, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the service subframe of radio frames and the configuration mode of special area in described first tdd systems, and in described first tdd systems initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems;
Coexistence configuration unit: the uplink service subframe, downlink business subframe and the special area that are used for disposing the described first tdd systems radio frames according to described configuration mode, and according to the frame timing information of described second tdd systems, the initial moment with radio frames in described second tdd systems is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of first tdd systems that described time offset is set.
The embodiment of the invention provides a kind of base station, comprising:
The coexistence determining unit: be used for according to the time slot allocation percent information of the second tdd systems radio frames of first tdd systems coexistence, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the service subframe of radio frames and the configuration mode of special area in described first tdd systems, and in described first tdd systems initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems;
Coexistence configuration unit: the uplink service subframe, downlink business subframe and the special area that are used for disposing the described first tdd systems radio frames according to described configuration mode, and according to the frame timing information of described second tdd systems, the initial moment with radio frames in described second tdd systems is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of first tdd systems that described time offset is set.
The coexistence method of the tdd systems that the embodiment of the invention provides and device, time slot allocation percent information according to radio frames in second tdd systems, determine with a radio frames to be configuration cycle, the configuration mode of radio frames in first tdd systems, and the initial moment of radio frames is with respect to the time offset in the initial moment of radio frames in second tdd systems, and dispose radio frames in first tdd systems according to configuration mode, determine the frame timing of first tdd systems according to the frame timing information of the time offset and second tdd systems, thereby make the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the ascending time slot of radio frames in first tdd systems and second tdd systems and the coincidence of descending time slot have been eliminated, reduce the interference between system greatly, realized the coexistence of first tdd systems and second tdd systems.
Description of drawings
Fig. 1 is a TD-CDMA system frame structure schematic diagram in the prior art;
Fig. 2 is a LTE TDD system frame structure schematic diagram in the prior art;
Fig. 3 is LTE TDD and a TD-CDMA coexistence of systems interference schematic diagram in the prior art;
Fig. 4 is the coexistence method flow chart of TDD system in the embodiment of the invention;
Fig. 5 is the coexisting apparatus block diagram of TDD system in the embodiment of the invention;
Fig. 6 is the configuration mode schematic diagram that disposes a pair of time slot switching point in the embodiment of the invention in the radio frames;
Fig. 7 is the configuration mode schematic diagram that disposes two pairs of time slot switching points in the embodiment of the invention in the radio frames.
Embodiment
The embodiment of the invention provides the coexistence method and the device of a kind of TDD system, with so that the time slot switching point of radio frames alignment in the time slot switching point of radio frames and second tdd systems in first tdd systems, to reduce the interference between system, realize the coexistence of first tdd systems and second tdd systems.
In the embodiment of the invention, first tdd systems is that example, second tdd systems are that example describes with the TD-CDMA system with LTE TDD system, when solving the coexistence problems of two the TDD systems identical with the TD-CDMA system frame structure, all can adopt the coexistence method of the TDD system that the embodiment of the invention provides with LTE TDD system frame structure.
The embodiment of the invention provides the coexistence method of a kind of TDD system, as shown in Figure 4, comprising:
S401, obtain and the frame timing information of the TD-CDMA system of LTE TDD coexistence of systems and the time slot allocation percent information of radio frames;
The time slot allocation percent information of the frame timing information of TD-CDMA system and radio frames also can directly be configured in the base station when the LTETDD system configuration;
S402, according to the time slot allocation percent information of radio frames in the TD-CDMA system, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in the LTE TDD system and the TD-CDMA system, the service subframe of radio frames and the configuration mode of special area in the LTE TDD system, and in the LTE TDD system initial moment of radio frames with respect to the time offset in the initial moment of radio frames in the TD-CDMA system;
S403, according to uplink service subframe, downlink business subframe and the special area of radio frames in the configuration mode configuration LTE TDD system, and according to the frame timing information of TD-CDMA system, the initial moment with radio frames in the TD-CDMA system is the benchmark moment, and it is the frame timing relative datum side-play amount constantly of LTE TDD system that time offset is set.
S401, S402 and S403 have realized the coexistence of TD-CDMA system and LTE TDD system, and be for the proper communication between realization base station and the subscriber equipment in LTE TDD system, further comprising the steps of:
The service subframe of radio frames and the configuration mode indication information of special area in S404, the broadcasting LTE TDD system.
Subscriber equipment according to the frame timing information of the LTE TDD system of self maintained realize with the base station synchronously, learn the service subframe of radio frames and the configuration mode of special area by the service subframe of radio frames and the configuration mode Indication message of special area, and according to this configuration mode collocating uplink service subframe, downlink business subframe and special area in the radio frames that this equipment sends, thereby realize the proper communication between the subscriber equipment and base station in the LTE TDD system.
The embodiment of the invention provides the coexisting apparatus of a kind of TDD system simultaneously, is arranged in the base station of LTE TDD system, and as shown in Figure 5, this device comprises:
Coexistence determining unit 501: be used for according to the time slot allocation percent information of the TD-CDMA system radio frames of LTE TDD coexistence of systems, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in the LTE TDD system and the TD-CDMA system, the service subframe of radio frames and the configuration mode of special area in the LTE TDD system, and in the LTE TDD system initial moment of radio frames with respect to the time offset in the initial moment of radio frames in the TD-CDMA system;
Coexistence configuration unit 502: be used for uplink service subframe, downlink business subframe and special area according to configuration mode configuration LTE TDD system radio frames, and according to the frame timing information of TD-CDMA system, the initial moment with radio frames in the TD-CDMA system is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of LTETDD system that time offset is set.
In order to realize the proper communication between the base station and subscriber equipment in the LTE TDD system, also comprise in this device:
Indication information transmitting element 503: be used for broadcasting the service subframe of LTE TDD system radio frames and the configuration mode indication information of special area.
Below according to the various time slot allocation percent informations of radio frames in the TD-CDMA system, introduce the service subframe of radio frames in the LTE TDD system that the embodiment of the invention provides and the configuration mode of special area in detail, and in the LTE TDD system initial moment of radio frames with respect to the time offset in the initial moment of radio frames in the TD-CDMA system.
At disposing a pair of time slot switching point and descending time slot in each 10ms radio frames in the TD-CDMA system: the ratio of ascending time slot is respectively the situation of 14:1,13:2,12:3,11:4,10:5, in LTE TDD system, with the 10ms radio frames is configuration cycle, and only dispose a pair of time slot switching point in the 10ms radio frames, the concrete service subframe and the configuration mode of special area are as shown in Figure 6.Each illustrated implication among Fig. 6 is introduced: SF0 represents service subframe #0, and SF1 represents service subframe # 1, and SF2 represents service subframe # 2, and SF3 represents service subframe # 3, and each service subframe is made up of two business time-slots; S represents special area, comprises DwPTS, GP and UpPTS; The service subframe that is assigned as the transmission downlink business is filled vertical line, the service subframe that is assigned as the transmission uplink service is filled oblique line; For special area, if do not have configurating downlink in this special area, be full downlink transfer so to up time slot switching point, then fill vertical line equally; Come downwards to the ascending time slot switching point if disposed in this special area, so grid is filled in the zone that is configured to DwPTS and GP in the special area, round dot is filled in the zone that is configured to UpPTS.Only provided the descending time slot of radio frames in the TD-CDMA system among Fig. 6: the ratio of ascending time slot is the special circumstances of 12:3, and the situation of other ratio is not represented.Be introduced respectively below:
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 14:1, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0;
The SF0 of another 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths.
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 13:2, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0;
The SF0 of another 5ms field, SF2 and SF3 are the downlink business subframe, SF1 is the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths.
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 12:3, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and do not dispose the time slot switching point in this field, include only descending pilot frequency time slot DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0;
The SF0 of another 5ms field and SF3 are the downlink business subframe, SF1 and SF2 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is made up of DwPTS, GP and UpPTS, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 14 OFDM symbol lengths and DwPTS is smaller or equal to 14 OFDM symbol lengths, the length of UpPTS is 0, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 12 OFDM symbol lengths and DwPTS smaller or equal to 12 OFDM symbol lengths, the length of UpPTS is 0.
When descending time slot in the TD-CDMA system: when the time slot ratio of ascending time slot is 11:4, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and do not dispose the time slot switching point in this field, include only descending pilot frequency time slot DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0;
The SF0 of another 5ms field and SF3 are the downlink business subframe, SF1 and SF2 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths.
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 10:5, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF1, SF2 and SF3 all are the downlink business subframe, and do not dispose the time slot switching point in this field, include only descending pilot frequency time slot DwPTS in the special area, when adopting the CP configuration, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0;
The SF0 of another 5ms field is the downlink business subframe, SF1, SF2 and SF3 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths.
At disposing two pairs of time slot switching points and descending time slot in each 10ms radio frames in the TD-CDMA system: the ratio of ascending time slot is respectively the situation of 9:6,7:8,6:9, in LTE TDD system, with the 10ms radio frames is configuration cycle, and two pairs of time slot switching points of configuration in the 10ms radio frames, the concrete service subframe and the configuration mode of special area are as shown in Figure 7.Identical among each illustrated implication and Fig. 6 among Fig. 7.Be introduced respectively below:
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 9:6, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field, SF2 and SF3 are the downlink business subframe, SF1 is the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths;
The SF0 of another 5ms field and SF3 are the downlink business subframe, SF1 and SF2 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths.
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 7:8, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field and SF3 are the downlink business subframe, SF1 and SF2 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is made up of DwPTS, GP and UpPTS, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 14 OFDM symbol lengths and DwPTS is smaller or equal to 14 OFDM symbol lengths, the length of UpPTS is 0, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 12 OFDM symbol lengths and DwPTS smaller or equal to 12 OFDM symbol lengths, the length of UpPTS is 0;
The SF0 of another 5ms field is the downlink business subframe, SF1, SF2 and SF3 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths.
When descending time slot in the TD-CDMA system: when the ratio of ascending time slot is 6:9, in the 10ms radio frames of LTE TDD system:
The SF0 of a 5ms field is the downlink business subframe, SF1, SF2 and SF3 are the uplink service subframe, special area is made up of DwPTS, GP and UpPTS, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths;
The SF0 of another 5ms field and SF3 are the downlink business subframe, SF1 and SF2 are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths.
At the time slot allocation percent information of radio frames in the TD-CDMA system, the configuration mode of the special area of radio frames is listed in table 2 in detail in the LTE TDD system.Each numeric representation OFDM symbolic number in the table 2.
Table 2
At the time slot allocation percent information of radio frames in the TD-CDMA system, the initial moment of radio frames lists in table 3 in detail with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTE TDD system.
Situation at a pair of time slot switching point of configuration in the radio frames in the TD-CDMA system is introduced respectively:
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 14:1, the initial moment of radio frames was stagnant 3 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 13:2, the initial moment of radio frames was stagnant 2 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 12:3, the initial moment of radio frames was stagnant 1 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 11:4, the initial moment of radio frames was stagnant 1 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 10:5, the initial moment of radio frames was 0 with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system.
Situation at two pairs of time slot switching points of configuration in the radio frames in the TD-CDMA system is introduced respectively:
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 9:6, the initial moment of radio frames was stagnant 1/3 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 7:8, the initial moment of radio frames was 0 with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system;
Descending time slot when radio frames in the TD-CDMA system: when the ratio of ascending time slot was 6:9, the initial moment of radio frames was stagnant 1/3 the service subframe length in back with respect to the time offset in the initial moment of radio frames in the TD-CDMA system in the LTETDD system.
Table 3
| TD-CDMA time slot ratio (descending: up) | The relative time side-play amount of LTE TDD radio frames |
| 14:1 | 3ms |
| 13:2 | 2ms |
| 12:3 | 1ms |
| 11:4 | 1ms |
| 10:5 | 0 |
| 9:6 | 0.333ms |
| 7:8 | 0 |
| 6:9 | 0.333ms |
The coexistence method and the device of the TDD system that the embodiment of the invention provides, make the time slot switching point alignment of radio frames in the time slot switching point of radio frames in the LTE TDD system and the TD-CDMA system, the ascending time slot of radio frames in LTETDD system and the TD-CDMA system and the coincidence of descending time slot have been eliminated, reduce the interference between system greatly, realized the coexistence of LTE TDD system and TD-CDMA system.And the embodiment of the invention is not limited to LTE TDD system and TD-CDMA system, when solving the coexistence problems of two tdd systems identical with the TD-CDMA system frame structure, all can adopt the coexistence method of the TDD system that the embodiment of the invention provides with LTE TDD system frame structure.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, a kind of coexistence method of tdd systems is characterized in that, comprising:
According to second tdd systems of first tdd systems coexistence in the time slot allocation percent information of radio frames, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the service subframe of radio frames and the configuration mode of special area in described first tdd systems, and in described first tdd systems initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems;
Dispose uplink service subframe, downlink business subframe and the special area of radio frames in described first tdd systems according to described configuration mode, and according to the frame timing information of described second tdd systems, the initial moment with radio frames in described second tdd systems is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of first tdd systems that described time offset is set.
2, the method for claim 1 is characterized in that, also comprises:
Broadcast the service subframe of radio frames in first tdd systems and the configuration mode indication information of special area.
3, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: a pair of time slot switching point of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 14:1;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: whole service subframe of a field are the downlink business subframe, and do not dispose the time slot switching point in this field, include only descending pilot frequency time slot DwPTS in the special area, when adopting short cyclic prefix CP to dispose, the length of DwPTS is 14 orthogonal frequency division multiplex OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length that comes downwards to up protection interval GP and uplink pilot time slot UpPTS is 0; Whole service subframe of another field are the downlink business subframe, and a pair of time slot switching point of configuration in this field, special area is made up of DwPTS, GP and UpPTS, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 3 service subframe length lag behind.
4, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: a pair of time slot switching point of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 13:2;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: whole service subframe of a field are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0; Second service subframe of another field is the uplink service subframe, other three service subframe are the downlink business subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 2 service subframe length lag behind.
5, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: a pair of time slot switching point of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 12:3;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: whole service subframe of a field are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0; First service subframe of another field and the 4th service subframe are the downlink business subframe, second service subframe and the 3rd service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 14 OFDM symbol lengths and DwPTS is smaller or equal to 14 OFDM symbol lengths, the length of UpPTS is 0, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 12 OFDM symbol lengths and DwPTS smaller or equal to 12 OFDM symbol lengths, the length of UpPTS is 0; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 1 service subframe length lags behind.
6, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: a pair of time slot switching point of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 11:4;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: whole service subframe of a field are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0; First service subframe of another field and the 4th service subframe are the downlink business subframe, second service subframe and the 3rd service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 1 service subframe length lags behind.
7, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: a pair of time slot switching point of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 10:5;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: whole service subframe of a field are the downlink business subframe, and do not dispose the time slot switching point in this field, include only DwPTS in the special area, when adopting short CP to dispose, the length of DwPTS is 14 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length of DwPTS is 12 OFDM symbol lengths, and the length of GP and UpPTS is 0; First service subframe of another field is the downlink business subframe, other three service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths; And,
The initial moment of radio frames is 0 with respect to the time offset in the initial moment of radio frames in second tdd systems in described first tdd systems.
8, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: two pairs of time slot switching points of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 9:6;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: second service subframe of a field is the uplink service subframe, other three service subframe are the downlink business subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths; First service subframe of another field and the 4th service subframe are the downlink business subframe, second service subframe and the 3rd service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 1/3 service subframe length lags behind.
9, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: two pairs of time slot switching points of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 7:8;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: first service subframe of a field and the 4th service subframe are the downlink business subframe, second service subframe and the 3rd service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 14 OFDM symbol lengths and DwPTS is smaller or equal to 14 OFDM symbol lengths, the length of UpPTS is 0, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 12 OFDM symbol lengths and DwPTS smaller or equal to 12 OFDM symbol lengths, the length of UpPTS is 0; First service subframe of another field is the downlink business subframe, other three service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths; And,
The initial moment of radio frames is 0 with respect to the time offset in the initial moment of radio frames in second tdd systems in described first tdd systems.
10, the method for claim 1 is characterized in that, the time slot allocation percent information of radio frames comprises in described second tdd systems: two pairs of time slot switching points of configuration and descending time slot in the radio frames: the ratio of ascending time slot is 6:9;
In first tdd systems of determining according to described time slot allocation percent information in the configuration mode of the service subframe of radio frames and special area: first service subframe of a field is the downlink business subframe, other three service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 12 OFDM symbol lengths and DwPTS is smaller or equal to 9 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 10 OFDM symbol lengths and DwPTS smaller or equal to 8 OFDM symbol lengths, the length of UpPTS is 2 OFDM symbol lengths; First service subframe of another field and the 4th service subframe are the downlink business subframe, second service subframe and the 3rd service subframe are the uplink service subframe, and a pair of time slot switching point of configuration in this field, special area is by DwPTS, GP and UpPTS form, when adopting short CP to dispose, the length sum of DwPTS and GP is that the length of 7 OFDM symbol lengths and DwPTS is smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 7 OFDM symbol lengths, perhaps when adopting long CP to dispose, the length sum of DwPTS and GP be the length of 6 OFDM symbol lengths and DwPTS smaller or equal to 4 OFDM symbol lengths, the length of UpPTS is 6 OFDM symbol lengths; And,
The initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems is in described first tdd systems: 1/3 service subframe length lags behind.
As the arbitrary described method of claim 1 to 10, it is characterized in that 11, described first tdd systems is a long-term advancing time division duplex LTE TDD system, described second tdd systems is a high spreading rate time division duplex TD-CDMA system.
12, a kind of coexisting apparatus of tdd systems is characterized in that, comprising:
The coexistence determining unit: be used for according to the time slot allocation percent information of the second tdd systems radio frames of first tdd systems coexistence, determine with a radio frames to be configuration cycle, when making the time slot switching point alignment of radio frames in the time slot switching point of radio frames in first tdd systems and second tdd systems, the service subframe of radio frames and the configuration mode of special area in described first tdd systems, and in described first tdd systems initial moment of radio frames with respect to the time offset in the initial moment of radio frames in second tdd systems;
Coexistence configuration unit: the uplink service subframe, downlink business subframe and the special area that are used for disposing the described first tdd systems radio frames according to described configuration mode, and according to the frame timing information of described second tdd systems, the initial moment with radio frames in described second tdd systems is the benchmark moment, and it is the regularly described relatively benchmark of the frame side-play amount constantly of first tdd systems that described time offset is set.
13, device as claimed in claim 12 is characterized in that, described device also comprises:
Indication information transmitting element: be used for broadcasting the service subframe of the first tdd systems radio frames and the configuration mode indication information of special area.
14, a kind of base station is characterized in that, comprises as claim 12 or 13 described devices.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710177132A CN101431808B (en) | 2007-11-09 | 2007-11-09 | Coexisting method and device of TDD system |
| US12/740,972 US8472465B2 (en) | 2007-11-02 | 2008-11-03 | Method and an apparatus for determining the radio frame structure of time division duplex system |
| EP08857870.3A EP2234292B1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| JP2010531402A JP2011502410A (en) | 2007-11-02 | 2008-11-03 | Method and apparatus for determining radio frame structure of time division duplex system |
| KR1020107012196A KR101110203B1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| PCT/CN2008/001840 WO2009070964A1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| JP2013046925A JP5542225B2 (en) | 2007-11-02 | 2013-03-08 | Method and apparatus for determining radio frame structure of time division duplex system |
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| CN200710177132A CN101431808B (en) | 2007-11-09 | 2007-11-09 | Coexisting method and device of TDD system |
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