CN102300314A - Mobile communication system and method for configuring uplink and downlink frequency bands - Google Patents
Mobile communication system and method for configuring uplink and downlink frequency bands Download PDFInfo
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- CN102300314A CN102300314A CN2010102181588A CN201010218158A CN102300314A CN 102300314 A CN102300314 A CN 102300314A CN 2010102181588 A CN2010102181588 A CN 2010102181588A CN 201010218158 A CN201010218158 A CN 201010218158A CN 102300314 A CN102300314 A CN 102300314A
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Abstract
The invention provides a method for configuring uplink and downlink frequency bands, which is applied to a mobile communication system based on a time division duplex mode. The time slot configuration mode of the mobile communication system is the same as that of the traditional time division duplex mobile communication system, the time synchronization demand of the mobile communication system is the same as that of the traditional time division duplex mobile communication system, and the uplink frequency band and the downlink frequency band of the mobile communication system based on the time division duplex mode are configured and are asymmetric. The invention also provides the mobile communication system based on the time division duplex mode. The scheme provided by the invention can ensure that the mobile communication system adopting the time division duplex mode avoids uplink and downlink interference with other mobile communication systems during mixed allocation under the condition of no reservation of a guard band.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of based on the mobile communication system of TDD mode and the method for configuration up-downgoing frequency range.
Background technology
Time division duplex (TDD, Time Division Duplexing) technology is one of duplex technology of mobile communication system use, and (FDD) is corresponding with Frequency Division Duplexing (FDD).
As shown in Figure 1, in the mobile communication system of tdd mode, the different time-gap of same frequency range is used to the uplink and downlink communication between the travelling carriage in the base station, separates receiving and transfer channel with the time, up-downgoing takies identical frequency range, and bin width is also identical.Its unidirectional resource is discontinuous in time, and time resource distributes on both direction.
FDD carries out uplink and downlink communication respectively on two symmetrical frequency channels that separate, separate the uplink and downlink channel with the protection frequency range.FDD must adopt paired frequency, relies on frequency to come the differentiating uplink and downlink link, and its unidirectional resource is continuous in time.
The work characteristics of TDD duplex mode makes TDD have following advantage with respect to FDD:
(1) need not paired frequency, can the flexible configuration frequency, use the not wield scattered frequency range of FDD system;
(2) can be by adjusting the uplink and downlink timeslot transfer point, the flexible configuration uplink and downlink timeslot ratio can be supported non-symmetrical service well;
(3) have up-downgoing channel consistency, the reception of base station and send can the common sparing radio frequency unit has reduced equipment cost;
When (4) receiving the up-downgoing data, do not need to receive and dispatch isolator, only need a switch to get final product, reduced the complexity of equipment;
(5) have the up-downgoing channel reciprocity, can adopt the transmission preconditioning technique better, as pre-RAKE technology, joint transmission (JT) technology, intelligent antenna technologies etc. can reduce the processing complexity of portable terminal effectively.
But the existing TDD mobile communication system also has following deficiency:
The up-downgoing transmission of TDD system takes whole frequency ranges, and when with other mobile communication system mixed deployments, the up-downgoing at working band inside or working band edge is disturbed will be inevitable; Isolating if carry out frequency band by the mode of reserving boundary belt, is again a kind of great waste to frequency spectrum resource then.
Summary of the invention
The invention provides the method for a kind of mobile communication system and configuration up-downgoing frequency range, the up-downgoing in the time of can avoiding with other mobile communication system mixed deployments under the situation of not reserving boundary belt is disturbed.
The embodiment of the invention proposes a kind of method that disposes the up-downgoing frequency range, this method is applied in the mobile communication system based on TDD mode, dispose the uplink band and the band downlink of described mobile communication system based on TDD mode, described uplink band and band downlink are asymmetric.
Described uplink band and band downlink be asymmetric to include but not limited to following any situation:
Described uplink band equates that with the bandwidth of band downlink the central point of uplink band does not overlap with the central point of band downlink;
The bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink;
The bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band overlaps with the central point of band downlink;
Described uplink band and/or band downlink have at least one discontinuous point;
Described uplink band and band downlink respectively have a discontinuous point, and discontinuous point overlaps fully.
There are not superposed part in described uplink band and band downlink.
Preferably, the uplink band and the band downlink of the described mobile communication system based on TDD mode of described configuration comprise:
Set in advance the configuration mode of multiple up-downgoing frequency range;
According to the system performance of other mobile communication system of described mobile communication system mixed deployment based on TDD mode, estimate the size of inter-system interference under each configuration mode;
A kind of configuration mode of selecting the inter-system interference minimum is as the described up-downgoing frequency range configuration mode that adopts based on the mobile communication system of TDD mode.
The embodiment of the invention also proposes a kind of mobile communication system based on TDD mode, described mobile communication system comprises base station and portable terminal, described base station and mobile terminal configuration time division duplex time slot, described base station is asymmetric to the uplink band of base station to the band downlink and the portable terminal of portable terminal.
As can be seen from the above technical solutions, under TDD mode, be configured to uplink band and band downlink asymmetric, the up-downgoing transmission just can not take whole frequency ranges like this, therefore help to improve when with other mobile communication system mixed deployments, the up-downgoing at working band inside or working band edge is disturbed.
Description of drawings
Fig. 1 is the up-downgoing frequency range configuration schematic diagram of existing time division duplex mobile communication system;
Fig. 2 is the typical frame structural representation of LTE TDD system;
Fig. 3 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention one;
Fig. 4 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention two;
Fig. 5 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention three;
Fig. 6 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention four;
Fig. 7 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention five;
Fig. 8 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention six;
Fig. 9 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention seven;
Figure 10 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention eight;
Figure 11 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention nine.
Embodiment
Under the situation of not considering allocation of space, the communication resource comprises time and two aspects of frequency.The essence of time division duplex will be divided into time slot one by one exactly the time, for each time slot, stipulate that it is ascending time slot or descending time slot, is respectively applied for transmit ascending data or downlink data.
A kind of typical frame structure of LTE TDD system as shown in Figure 2.Each radio frames is made of two fields (half-frame), and each field length is 5ms.Each field be divided into the conventional time slot that 8 length are 0.5ms (Time Slot, TS) and 1 special area that length is 1ms, per two conventional time slots are composed of a subframe, wherein i subframe constitutes with 2i+1 time slot by 2i.This special area is made of descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS), and the length of DwPTS and UpPTS is configurable, and the total length of DwPTS, GP and UpPTS equals 1ms.Subframe 1 and subframe 6 comprise DwPTS, GP and UpPTS.Wherein, subframe 0 and subframe 5 and DwPTS are reserved as downlink transfer forever.Other subframes can be configured to downlink transfer or uplink.LTE TDD system supports the switching cycle of 5ms and 10ms.
Standard determines that the time slot ratio configuration of supporting is as shown in table 1 at present.
Table 1
Wherein, alphabetical D represents descending time slot, and letter U is represented ascending time slot, and alphabetical S represents special time slot.Allocation plan 0,1,2 is the time slot transfer point cycle of 5ms, and allocation plan 3-6 is the time slot transfer point cycle of 10ms.
In the existing time division duplex mobile communication system, the shared frequency range of ascending time slot and descending time slot is identical.The mobile communication system that the present invention proposes adopts time slot configuration scheme and the time synchronized requirement identical with existing time division duplex mobile communication technology, and simultaneously according to the actual deployment requirements of network, it is asymmetric that the up-downgoing frequency range is set.So-called up-downgoing frequency range symmetry be meant that the bandwidth of uplink band and band downlink is identical, and central point overlaps.Up-downgoing frequency range other situations except symmetry are asymmetric.
Wherein, this system's up-downgoing frequency range be provided with can based on but be not limited to following network design demand:
1, with this system performance (as above downlink resource configuration, sub-band bandwidth, transmitting power, radio-frequency (RF) index etc.) based on the other system of the mobile communication system mixed deployment of TDD mode;
2, the signal component of other system may fall into this based on the situation in the mobile communication system frequency band of TDD mode.
In addition, can be unidirectional (uplink band has an end points to overlap with the bandwidth of band downlink) based on the frequency shift (FS) between the mobile communication system up-downgoing frequency range of TDD mode among the present invention, also can be two-way (end points does not all overlap); This frequency shift (FS) can be (bandwidth is wideer than prior art) of expansion, also can be (bandwidth is narrower than prior art) of shrinking; The shared frequency of up-downgoing frequency range can have lap, also can not have lap; The up-downgoing band bandwidth can be identical, also can be different; The shared frequency of up-downgoing frequency range can be continuous, also discontinuous point can be arranged; This discontinuous point can be single, also can be a plurality of; The discontinuous point quantity of up-downgoing frequency range inside can be identical, also can be different; The shared frequency of up-downgoing frequency range point of internal discontinuity can be overlapping, also can be not overlapping;
Fig. 3 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention one.Wherein, the bandwidth of up-downgoing frequency range is still identical, but the intermediate frequency of uplink band no longer align with the intermediate frequency of band downlink, but have side-play amount a.Among this embodiment, uplink band equates that with the bandwidth of band downlink the central point of uplink band does not overlap with the central point of band downlink.
Fig. 4 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention two.The up-downgoing band bandwidth does not wait, and the HFS (right side) that shows as DL has side-play amount c with respect to UL, and the low frequency part of UL has side-play amount b with respect to DL, and b is not equal to c.Among this embodiment, the bandwidth of uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink.
Fig. 5 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention three.The up-downgoing band bandwidth does not wait, band downlink expansion (also can regard uplink band as shrinks).Among this embodiment, the bandwidth of uplink band and band downlink does not wait, and the central point of uplink band overlaps with the central point of band downlink.
Fig. 6 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention four.The up-downgoing band bandwidth does not wait, uplink band expansion (also can regard band downlink as shrinks).Among this embodiment, the bandwidth of uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink.
Fig. 7 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention five.The up-downgoing band bandwidth does not wait, and band downlink expansion has 1 discontinuous point in the shared frequency of band downlink.
Fig. 8 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention six.The up-downgoing band bandwidth equates, the uplink band expansion has 1 discontinuous point in the shared frequency of uplink band.
Fig. 9 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention seven.The up-downgoing band bandwidth does not wait, and in the shared frequency of band downlink 2 discontinuous points is arranged.
Figure 10 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention eight.The up-downgoing band bandwidth does not wait, and in the shared frequency of up-downgoing frequency range 1 discontinuous point is arranged respectively, and discontinuous point overlaps fully.
The characteristics of Fig. 7-10 are: described uplink band and/or band downlink have at least one discontinuous point.
Figure 11 is the up-downgoing frequency range configuration schematic diagram of the embodiment of the invention nine.The shared frequency of up-downgoing frequency range does not have lap.The up-downgoing frequency range of this embodiment is similar to the frequency range configuration in the FDD system, but following difference is arranged: at first, still adopt the time slot configuration mode of TDD system; Secondly, the up-downgoing transmission need be satisfied time synchronized; Once more, the width of up-downgoing frequency range does not require equal, and the up-downgoing bin width must equate in the FDD system.
Preferably, can set in advance the configuration mode of multiple up-downgoing frequency range, described each configuration mode can be corresponding to an above-mentioned embodiment, but is not limited to the cited various situations of the foregoing description.According to the system performance of other mobile communication system of described mobile communication system mixed deployment based on TDD mode, estimate the size of inter-system interference under each configuration mode; A kind of configuration mode of selecting the inter-system interference minimum is as the described up-downgoing frequency range configuration mode that adopts based on the mobile communication system of TDD mode.
The embodiment of the invention has proposed a kind of mobile communication system based on TDD mode, described time division duplex mobile communication system comprises base station and portable terminal, described base station and mobile terminal configuration time division duplex time slot, described base station is asymmetric to the uplink band of base station to the band downlink and the portable terminal of portable terminal.
Wherein, uplink band and band downlink are asymmetric, can be one of following situations:
Described uplink band equates that with the bandwidth of band downlink the central point of uplink band does not overlap with the central point of band downlink;
The bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink;
The bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band overlaps with the central point of band downlink;
Described uplink band and/or band downlink have at least one discontinuous point;
Described uplink band and band downlink respectively have a discontinuous point, and discontinuous point overlaps fully;
There are not superposed part in described uplink band and band downlink.
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 made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (15)
1. method that disposes the up-downgoing frequency range, this method is applied in the mobile communication system based on TDD mode, it is characterized in that dispose the uplink band and the band downlink of described mobile communication system based on TDD mode, described uplink band and band downlink are asymmetric.
2. method according to claim 1 is characterized in that, described uplink band equates that with the bandwidth of band downlink the central point of uplink band does not overlap with the central point of band downlink.
3. method according to claim 1 is characterized in that the bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink.
4. method according to claim 1 is characterized in that the bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band overlaps with the central point of band downlink.
5. method according to claim 1 is characterized in that described uplink band and/or band downlink have at least one discontinuous point.
6. method according to claim 1 is characterized in that, described uplink band and band downlink respectively have a discontinuous point, and discontinuous point overlaps fully.
7. method according to claim 1 is characterized in that there are not superposed part in described uplink band and band downlink.
8. according to each described method of claim 1 to 7, it is characterized in that the uplink band and the band downlink of the described mobile communication system based on TDD mode of described configuration comprise:
Set in advance the configuration mode of multiple up-downgoing frequency range;
According to the system performance of other mobile communication system of described mobile communication system mixed deployment based on TDD mode, estimate the size of inter-system interference under each configuration mode;
A kind of configuration mode of selecting the inter-system interference minimum is as the described up-downgoing frequency range configuration mode that adopts based on the mobile communication system of TDD mode.
9. mobile communication system based on TDD mode, described mobile communication system comprises base station and portable terminal, described base station and mobile terminal configuration time division duplex time slot, it is characterized in that described base station is asymmetric to the uplink band of base station to the band downlink and the portable terminal of portable terminal.
10. the mobile communication system based on TDD mode according to claim 9 is characterized in that, described uplink band equates that with the bandwidth of band downlink the central point of uplink band does not overlap with the central point of band downlink.
11. the mobile communication system based on TDD mode according to claim 9 is characterized in that the bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band does not overlap with the central point of band downlink.
12. the mobile communication system based on TDD mode according to claim 9 is characterized in that the bandwidth of described uplink band and band downlink does not wait, and the central point of uplink band overlaps with the central point of band downlink.
13. the mobile communication system based on TDD mode according to claim 9 is characterized in that described uplink band and/or band downlink have at least one discontinuous point.
14. the mobile communication system based on TDD mode according to claim 9 is characterized in that, described uplink band and band downlink respectively have a discontinuous point, and discontinuous point overlaps fully.
15. the mobile communication system based on TDD mode according to claim 9 is characterized in that there are not superposed part in described uplink band and band downlink.
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Application publication date: 20111228 |