CN101102525A - An uplink and downlink conversion time generation method of LTE class II frame structure - Google Patents
An uplink and downlink conversion time generation method of LTE class II frame structure Download PDFInfo
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- CN101102525A CN101102525A CNA2007101412723A CN200710141272A CN101102525A CN 101102525 A CN101102525 A CN 101102525A CN A2007101412723 A CNA2007101412723 A CN A2007101412723A CN 200710141272 A CN200710141272 A CN 200710141272A CN 101102525 A CN101102525 A CN 101102525A
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Abstract
The method comprises: pre-setting the base station side uplink and downlink switching time Tud=max(Tud_UE_max, Tud_NB); wherein Tud_UE_max is the up limit of mobile phone switching time, and the Tud_NB is the uplink and downlink switching time required by the base station; during uplink synchronous process, the base station makes real-time detection and calculates the 2X/C corresponding to each mobile phone; wherein the X is the distance between the mobile phone and base station, and C is light velocity; the base station sends the periodical time adjustment 2X/C+Tud to the corresponding mobile phone; according to the periodical time adjustment 2X/C+Tud, the mobile phone sends the uplink data on its corresponding LTE second type frame.
Description
Technical field
The present invention relates to, be specifically related to a kind of LTE second class frame structure up-downgoing and generate method change-over time.
Background technology
Long evolving system Long Term Evolution (be called for short LTE) system definition two class frame structures, the second class frame wherein, structure corresponding to the Long Term Evolution of TD-SCDMA, adopts time division multiplexing Time Division Duplex (being called for short TDD) pattern as shown in Figure 1.In the second class frame structure, subframe 0 (subframe 0) fixedly descends line data; N subframe is used to catch line data before among the subframe 1-6, and a back 6-n subframe is used to descend line data (1≤n≤6); Special time slot; comprise: descending pilot frequency time slot Downlink Pilot Time Slot (being called for short DwPTS) is used to transmit down-going synchronous information; boundary belt GuardPeriod (being called for short GP) is used to provide protection, and uplink pilot time slot Uplink Pilot Time Slot (being called for short UpPTS) is used to transmit uplink synchronous information.Simultaneously, in order to support big sub-district, preceding m subframe of 1-6 work song frame also can be used for catching capable synchronizing information, and the preceding n in the at this moment remaining upstream data subframe is used for catching line data, and back 6-m-n is individual to be used to descend line data.
In the TDD system, the change-over time that mobile phone and base station need be certain when being up to descending or downstream-to-upstream conversion.In the second class frame structure, GP can be used as the change-over time of base station or mobile phone downstream-to-upstream; The conventional method that acquisition is up to the down conversion time is to stay a blank boundary belt Timeslot Interval (being called for short TI) in each subframe back, as shown in Figure 1.This method has the shortcoming of following two aspects: (1) has only the boundary belt 11 of blank at ascending-descending subframes transfer point place just useful, reserves the shared time of TI in other subframe all to be wasted; (2) up-downgoing is reserved change-over time, certainly will in agreement, be stipulated the value of TI, and this value generally is relatively conservative, like this for up-downgoing change-over time also giving birth to waste than equipment faster.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of LTE second class frame structure up-downgoing and generate method change-over time, can avoid at each subframe back reservation TI, produce waste, also can regulate Timing Advance simultaneously, make that change-over time, fast equipment can be supported bigger radius of society according to the change-over time of devices from different manufacturers.
Above-mentioned technical problem of the present invention solves like this, provides a kind of LTE second class frame structure up-downgoing to generate method change-over time, may further comprise the steps:
1.1) preestablish base station side up-downgoing T change-over time
Ud=max (T
Ud_UE_max, T
Ud_NB), wherein: T
Ud_UE_maxBe the mobile phone upper limit of change-over time, T
Ud_NBBe the needed up-downgoing in base station change-over time;
1.2) in the uplink synchronous process, the corresponding 2X/C of each mobile phone is detected and calculated in the base station in real time, wherein: X is the distance of mobile phone apart from the base station, and C is the light velocity; 2X/C regularly i.e. adjustment amount sends and arrive mobile phone upstream data. signals arrival base station compensation of delay altogether again;
1.3) base station will timing adjustment amount 2X/C+T
UdIssue corresponding mobile phone;
1.4) mobile phone receives and by corresponding regularly adjustment amount 2X/C+T
UdSend the upstream data on the corresponding separately LTE second class frame.
According to generation method provided by the invention, described step 1.2) in to detect in real time be the position of detecting the random access channel preamble signal.
According to generation method provided by the invention, extended protection band KGP is reserved in first upstream data subframe front that this method also is included in the described LTE second class frame, the boundary belt GP in the expansion special time slot.
According to generation method provided by the invention, the length T of described extended protection band
TI＞T
Ud
According to generation method provided by the invention, this method also is included in the described LTE second class frame continuously not the compartment of terrain and places 6 subframes that come the back, that is: the boundary belt TI that blanks in advance of each the subframe back in these 6 subframes not avoids producing waste.
According to generation method provided by the invention, described 6 subframes comprise one or more upstream data subframes that are positioned at the front and the one or more down data subframes that are positioned at the back.
According to generation method provided by the invention, described 6 subframes also can comprise and are positioned at top one or more uplink synchronous information subframe.
According to generation method provided by the invention, the described LTE second class frame structure also comprises and comes top 1 subframe and and come special time slot between 6 subframes of back.
According to generation method provided by the invention, described special time slot comprises descending pilot frequency time slot, boundary belt and uplink pilot time slot.
According to generation method provided by the invention, the described LTE second class frame structure comprises 7 subframes altogether, and wherein, described to come top 1 subframe be down data subframes.
The LTE provided by the invention second class frame structure up-downgoing generates method change-over time; only reserve extended protection band KGP replaces reserving a blank boundary belt TI in each subframe back in first upstream data subframe front; thereby can avoid waste; also can regulate Timing Advance simultaneously, make that change-over time, fast equipment can be supported bigger radius of society according to the change-over time of devices from different manufacturers.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the conventional method LTE second class frame structure schematic diagram;
Fig. 2 is the timing advance of the LTE second class frame structure data burst of the present invention;
Fig. 3 is the timing advance (adding TI) of the LTE second class frame structure data burst of the present invention;
Fig. 4 is the schematic diagram of UE of the present invention position in the sub-district;
Embodiment
The first, operation principle of the present invention is described:
(1) when carrying out uplink synchronous, the timing adjustment amount that mobile phone is issued in the base station should guarantee moment that the upward signal of mobile phone emission arrives the base station and (also shift to an earlier date T the finish time of upstream data subframe accordingly than zero hour of first upstream data subframe of base station side shifting to an earlier date Tud
Ud).As shown in Figure 2, so just having produced length in base station side is T
UdUp-downgoing change-over time;
(2) as shown in Figure 2, be 2X/C+T up-downgoing change-over time of mobile phone
Ud(wherein X is the distance of mobile phone and base station, and C is the light velocity), so generally speaking, the change-over time of mobile phone can be more sufficient than the base station.But in order to guarantee that all mobile phones (comprising the mobile phone very near from the base station, i.e. X=0) and base station can both obtain enough up-downgoing change-over time, should satisfy T
Ud=max (T
Ud_UE_max, T
Ud_NB), wherein: T
Ud_UE_maxBe the mobile phone upper limit of change-over time, T
Ud_NBBe the needed up-downgoing in base station change-over time;
(3) as shown in Figure 2, the timing advance of upstream data subframe can shorten the boundary belt GP of uplink synchronous channel, causes dwindling of uplink synchronous channel coverage.In order to address this problem, as shown in Figure 3, we reserve the extended protection band KGP that length is TTI in first upstream data subframe front, work as T like this
Ud＜T
TIThe time, the timing advance of upstream data subframe not only can not shorten, and also can increase the boundary belt GP of uplink synchronous channel, and recruitment is T
TI-T
Ud
The second, further specify the present invention in conjunction with concrete application of the inventive method:
Suppose that the LTE system bandwidth is 20MHz.In the LTE second class frame structure; subframe 0 is used for transmitting downlink data; DwPTS is used to transmit down-going synchronous information; GP is a boundary belt; UpPTS is used to transmit uplink synchronous information; be Random Access Channel Random Access CHannel leading (preamble) of (being called for short RACH); subframe 1-2 is as upstream data subframe, transmit ascending data; subframe 3-6 is as down data subframes, transmitting downlink data, and the length of the extended protection band KGP that first upstream data subframe is reserved previously is TTI=8us.
Suppose the needed up-downgoing of base station equipment T change-over time
Ud_NB=4us, the upper limit T of mobile phone change-over time
Ud_UE_max=5us is then according to top algorithm, T
Ud=5us.
As shown in Figure 4, suppose mobile phone 2 certain position P in the sub-district, 1 distance is X apart from the base station for it.In the process of uplink synchronous, base station 1 can calculate 2X/C (it is the beginning of base station side upstream data subframe that mobile phone carries out regularly adjusting the moment that can guarantee upstream data. signals arrival base station according to this value) by the position of detecting RACH preamble.In order to realize the timing advance of base station side upstream data, the timing adjustment amount that this mobile phone is issued in the base station should be 2X/C+T
Ud, mobile phone upstream data. signals moment of arriving the base station will shift to an earlier date T than the zero hour of the uplink frame of base station side like this
Ud(also can shift to an earlier date T the finish time of uplink frame
Ud).Like this, T change-over time of the up-downgoing of base station acquisition
Ud, mobile phone obtains up-downgoing change-over time is 2X/C+T
UdIn addition, because T
TI-R
Ud=3us, promptly GP has enlarged 3us, so the coverage of RACH has increased (recruitment of coverage can be taken into account) in the network planning.
At last; above-described execution mode is an embodiment of the present invention; under the situation of spirit of the present invention and essence; the technical staff can produce other embodiment according to the present invention, but these embodiment based on spirit of the present invention and essence also should belong within the protection range of claims of the present invention.
Claims (10)
1, a kind of LTE second class frame structure up-downgoing generates method change-over time, it is characterized in that, may further comprise the steps:
1.1) preestablish base station side up-downgoing T change-over time
Ud=max (T
Ud_UE_max, T
Ud_NB), wherein: T
Ud_UE_maxBe the mobile phone upper limit of change-over time, T
Ud_NBBe the needed up-downgoing in base station change-over time;
1.2) in the uplink synchronous process, the corresponding 2X/C of each mobile phone (2) is detected and calculated in base station (1) in real time, wherein: X is the distance of mobile phone apart from the base station, and C is the light velocity;
1.3) base station (1) will timing adjustment amount 2X/C+T
UdIssue corresponding mobile phone (2);
1.4) mobile phone (2) receives and by corresponding regularly adjustment amount 2X/C+T
UdSend the upstream data on the corresponding separately LTE second class frame.
2, according to the described generation method of claim 1, it is characterized in that described step 1.2) in to detect in real time be the position of detecting the random access channel preamble signal.
According to the described generation method of claim 1, it is characterized in that 3, the extended protection band is reserved in first upstream data subframe front that this method also is included in the described LTE second class frame.
4, according to the described generation method of claim 2, it is characterized in that the length T of described extended protection band
TI＞T
Ud
According to the described generation method of claim 1, it is characterized in that 5, this method also is included in and does not place 6 subframes that come the back in the described LTE second class frame continuously at interval.
According to the described generation method of claim 5, it is characterized in that 6, described 6 subframes comprise one or more upstream data subframes that are positioned at the front and the one or more down data subframes that are positioned at the back.
According to the described generation method of claim 6, it is characterized in that 7, described 6 subframes also comprise and are positioned at top one or more uplink synchronous information subframe.
According to the described generation method of claim 5, it is characterized in that 8, the described LTE second class frame structure also comprises and comes top 1 subframe and and come special time slot between 6 subframes of back.
9, described according to Claim 8 generation method is characterized in that, described special time slot comprises descending pilot frequency time slot, boundary belt and uplink pilot time slot.
10, described according to Claim 8 generation method is characterized in that, the described LTE second class frame structure comprises 7 subframes altogether, and wherein, described to come top 1 subframe be down data subframes.
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| CN2007101412723A CN101102525B (en) | 2007-08-06 | 2007-08-06 | An uplink and downlink conversion time generation method of LTE class II frame structure |
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| CN2007101412723A CN101102525B (en) | 2007-08-06 | 2007-08-06 | An uplink and downlink conversion time generation method of LTE class II frame structure |
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