CN100566214C - The communication means of time division duplex mobile communication system - Google Patents
The communication means of time division duplex mobile communication system Download PDFInfo
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Abstract
A kind of communication means of time division duplex mobile communication system, comprise: (1) is provided with least unit and the system frame structure of Transmission Time Interval TTI, each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and described TTI is to be least unit with a business time-slot in the described wireless sub-frame; (2) the transmitting terminal frame structure that will need the data that send to set according to step (1) is encoded, is modulated the back and sends by radio frequency; (3) receiving terminal receives the demodulation of data elder generation, the frame structure decoding back according to step (1) setting obtains corresponding data then, and the TTI according to step (1) setting returns the reception response message subsequently, so that transmitting terminal sends next data, and then finishes transfer of data.Special time slot can also comprise a UpPTS and a DwPTS time slot, perhaps also comprises a DwPTS time slot.By to the improvement of tdd frame structure and the unit interval length that reduces TTI, reach the effect that reduces data transmission delay.
Description
Technical field
The present invention relates to the communication means in the mobile communication system, the communication means in particularly a kind of time division duplex (TDD) mobile communication system.
Background technology
Mobile radio system develops into present 3-G (Generation Three mobile communication system) from the analog communication system of frequency division multiple access (FDMA), and the business of support develops into present data and the mixed business of speech from simple voice service, until data service at a high speed.The TDD mobile communication system also is the wherein a kind of communication mode that adopts in the 3G (Third Generation) Moblie standard.The characteristics of TDD mobile communication system are that uplink and downlink are in a frequency range together, do not need paired frequency, so the spectrum utilization height, and the correlation of up-downgoing resource is little, and these are that tool has great advantage with respect to Frequency Division Duplexing (FDD) (FDD) system.
The physical layer frame structure of TDD mobile communication system is referring to Fig. 1, Fig. 2.Fig. 1 is a prior art TDD system physical layer frame structure schematic diagram, and Fig. 2 is a schematic diagram of prior art subframe time slot allocation structure.The TDD system physical layer adopts three-decker: radio frames, subframe, time slot.Each radio frames frame length is 10ms, the subframe that it comprises two frame lengths is 5ms; Each subframe comprises time slot TS0-time slot TS6 totally seven business time-slots, simultaneously, comprises three special time slots between time slot TS0 and time slot TS1: descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS).Descending pilot frequency time slot is used for the transmission of the down-going synchronous information of system, and uplink pilot time slot is used for the uplink synchronous information transmission that the user inserts, and the protection time slot is used to provide the slot time of descending sending time slots to up sending time slots conversion.
In the physical layer frame of TDD system, time slot TS0 fixed allocation is a descending time slot, and time slot TS1 fixed allocation is given ascending time slot, and the distribution of other up-downgoing business time-slots can be adopted symmetry and asymmetric dual mode, and promptly the up-downgoing business time-slot can dynamic assignment.In the 3GPP standard, two up-downgoing transfer points (switching Point) are arranged between the business time-slot of the wireless sub-frame of each 5ms, this up-downgoing transfer point is positioned at time slot TS0 and time slot TS1 in Fig. 2, and between time slot TS3 and the TS4.3GPP standard regulation time slot TS0 simultaneously is fixed for the transmission of downstream message, and time slot TS1 is fixed for the transmission of upstream message.Therefore, the transfer point between time slot TS0 and the time slot TS1 is changeless, is used for the downlink business time slot and changes to the uplink service time slot.The needs of this transfer point in order to guarantee that system uplink is synchronous provide a translation and protection time slot GP.Another transfer point can be between other arbitrary business time-slot, and this transfer point is up time point to down conversion, and the translation and protection time slot is not set specially.
The communication process of time division duplex mobile communication system: transmitting terminal is encoded, is modulated the back with data according to predefined radio frames form and sends by radio frequency, the demodulation of receiving terminal received RF signal elder generation, decoding back obtain corresponding data, send to the opposite end by channel then and receive response message, transmitting terminal receives the transmission of carrying out next data after the response message, analogize in view of the above, finish the transmission of all data.
Transmitting terminal is set up a slip send window usually, transmission be to be in the data that send in the sliding window.After transmitting terminal received the reception response message that receiving terminal returns, sliding window was to front slide, and the data that newly enter sliding window send as next data.For the TCP/IP data service, per call throughput (Call Throughout) is except outside the Pass having with the size that sends sliding window, and also the transmission delay with data is relevant.Sending under big or small certain situation of sliding window, delaying more for a short time, call throughput is big more.In mobile communication, the length of the wireless data transmission time interval of transmission delay and air interface (Transmission Time Interval, Transmission Time Interval TTI) has relation, and the unit length of TTI is more little, and its propagation delay time is more little.At present the TTI of the air interface of 3GPP code requirement TD-SCDMA system is to be unit with frame or subframe, is a frame (10ms) length as the TTI least unit of R4 release requirement, and the TTI that the HSDPA of R5 version requires is a wireless sub-frame (5ms) length.
With the TD-SCDMA communication system is example, its communication process of simple declaration.Suppose that the up-downgoing business time-slot is configured to 1: 5 (removing TS0), the unit length of TTI is 5ms.Its downlink communication process is: UE is the DwPTS gap information by receiving earlier, sets up with network side synchronous; Receive the broadcast on the TS0 time slot then, obtain corresponding configuration information.When network terminal will send data to UE, network side sends the call information of calling out this UE by the TS0 time slot, and UE sends random access information to network terminal by the UpPTS time slot.After network termination is received the random accessing message of UE, can send its control messages to UE, same, UE also can be to the network terminal response message.Network terminal is distributed corresponding channel resources to UE, and both communicate by this allotted channel resource.
Network terminal is chosen on the TS2 time slot of N subframe and sends data, and receiving terminal UE went forward side by side after corresponding the processing receiving data, need send one to network terminal and receive response message.Because the size of TTI is 5ms, therefore UE must send in next subframe at the soonest and receive response message: promptly UE sends response message to network terminal in the TS1 of N+1 subframe time slot, and is bigger to the time delay the TS1 time slot of N+1 subframe from the TS2 time slot of N subframe.Just there are overlong time to be sent such as UE at present, thereby cause propagation delay time longer, user's call throughput is affected.
Summary of the invention
The object of the present invention is to provide a kind of communication means of time division duplex mobile communication system, transmitting terminal wait receiving terminal returns the overlong time that receives response message in the prior art to solve, thereby cause propagation delay time longer, and then influence the affected technical problem of throughput.
For addressing the above problem, the present invention discloses a kind of communication means of time division duplex mobile communication system, comprise: (1) is provided with least unit and the system frame structure of Transmission Time Interval TTI, each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and described TTI is to be least unit with a business time-slot in the described wireless sub-frame; (2) the transmitting terminal frame structure that will need the data that send to set according to step (1) is encoded, is modulated the back and sends by radio frequency; (3) receiving terminal received RF signal elder generation demodulation, the frame structure decoding back of setting according to step (1) then obtain corresponding data, the TTI that sets according to step (1) returns the reception response message subsequently, so that transmitting terminal sends next packet, and then finish transfer of data.
Step (1) is according to system the number of translation and protection time slot to be set in the requirement of replying time interval time delay, and described number M satisfies
N is a business time-slot number in each subframe.
The special time slot of setting in the step (1) can also comprise a uplink pilot time slot UpPTS and a descending pilot frequency time slot DwPTS, UpPTS that sets and DwPTS can be that all period interval send with the experimental process frame number, perhaps the special time slot of step (1) setting can also comprise a DwPTS, and the DwPTS of setting can be that all period interval send with the experimental process frame number.
In the subframe structure that step (1) is set; time slot TS0 is a descending time slot; time slot TS1 is an ascending time slot; minimum interval between adjacent two translation and protection time slots is 2 business time-slots; and also has a business time-slot in the subframe after last translation and protection time slot at least; if there is DwPTS in the subframe; then this DwPTS is positioned at after the time slot TS0; if there is UpPTS in the subframe; this UpPTS is positioned at after K the translation and protection time slot; M 〉=K＞1, M is the number of translation and protection time slot in each subframe.
Set the number of business time-slot in each subframe more than or equal to 7 in step (1).
Step (2) also comprises before: transmitting terminal is set up a slip send window, and the data that need to send are positioned at the transmission sliding window; Step (3) also comprises: if transmitting terminal receives the reception response message that receiving terminal returns in the predefined time, sliding window is to front slide, and the data that newly enter sliding window send as next pre-data that send.
The invention discloses the communication means of second kind of time division duplex mobile communication system, comprise: (1) is provided with least unit and the system frame structure of Transmission Time Interval TTI, each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and described TTI is to be least unit with a business time-slot in the described wireless sub-frame; (2) user terminal set up earlier with network side synchronously, then by receiving the TS0 time slot, obtain the broadcast that sends by network side, and then obtain its configuration information, described configuration information comprises TTI and the system-frame information that step (1) is set; (3) network side/user terminal sends call information to the opposite end, and the TTI that the opposite end is set according to step (1) carries out call answering; (4) network side is to the user terminal allocation of channel resources may, and network side is set up by described allotted channel resource with user terminal and communicated by letter.
Step (1) is according to system the number of translation and protection time slot to be set in the requirement of replying time interval time delay, and described number M satisfies
N is a business time-slot number in each subframe.
The special time slot of setting in the step (1) can also comprise a uplink pilot time slot UpPTS and a descending pilot frequency time slot DwPTS, UpPTS that sets and DwPTS can be that all period interval send with the experimental process frame number, perhaps the special time slot of step (1) setting can also comprise a DwPTS, and the DwPTS of setting can be that all period interval send with the experimental process frame number.
In the subframe structure that step (1) is set; time slot TS0 is a descending time slot; time slot TS1 is an ascending time slot; minimum interval between adjacent two translation and protection time slots is 2 business time-slots; and also have a business time-slot in the subframe after last translation and protection time slot at least, if there is uplink pilot time slot, then described uplink pilot time slot is positioned at after K the translation and protection time slot; M 〉=K＞1, M is the number of translation and protection time slot in each subframe.
Step (2) if in have descending pilot frequency time slot in the subframe, user terminal by receive descending pilot frequency time slot set up with network side synchronously, otherwise will set up synchronous with network side by the information on the downlink business time slot.
Network side is set up communicate by letter by described allotted channel resource with user terminal and specifically comprised in the step (4): the frame structure that the data that transmitting terminal will need to send are set according to step (1) encodes, modulate and then send by radio frequency; Elder generation's demodulation of receiving terminal received RF signal and the corresponding packet of setting according to step (1) of frame structure decoding back acquisition, the TTI unit that sets according to step (1) returns the reception response message then, so that transmitting terminal sends next data, and then finish transfer of data.
Compared with prior art; the present invention has the following advantages: the present invention is by improving the frame structure of TDD system: the number of setting up the protection time slot in each subframe; and combine with the TTI unit interval length that reduces system, reach the effect of the transfer of data time-delay that reduces in the communication process.
In addition, the present invention is by improving the frame structure of TDD system: is the number that all period interval send and improve the business time-slot in each subframe with the up-downgoing pilot time slot by a number of sub frames, improves data quantity transmitted with this, and then improves the speed of transmission data.
In addition, the present invention is by improving the frame structure of TDD system: the setting spacing of up-downgoing pilot time slot is strengthened transmission, the interference when the minimizing up-downgoing is synchronous.
Description of drawings
Fig. 1 is the physical layer frame structure schematic diagram of TDD mobile communication system in the prior art;
Fig. 2 is a schematic diagram of prior art subframe time slot allocation structure;
Fig. 3 is the flow chart of the communication means of a kind of time division duplex mobile communication system disclosed by the invention;
Fig. 4 is a kind of physical layer frame structure schematic diagram of TDD mobile communication system of the present invention;
Fig. 5 is the flow chart of the communication means of another kind of time division duplex mobile communication system disclosed by the invention;
Fig. 6 is a schematic diagram of subframe time slot allocation structure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
The TTI of 3GPP code requirement TD-SCDMA communication system is a unit with frame or subframe at present.In order to reduce the propagation delay time of Radio Access Network, the applicant considers the time span unit that reduces TTI.Such as with the business time-slot being the least unit that unit sets TTI, reduce response time at interval with this.The physical layer of supposing network side and user terminal is to adopt the disclosed frame structure of Fig. 2, though the least unit of TTI is a business time-slot, because the up-downgoing transfer point is few, and the situation that the transfer of data response time can not reduce at interval significantly.In order to reply the data that the TS2 time slot sends, descending transmission data must send on the TS1 of next wireless sub-frame time slot, and response time is spaced apart 5ms.As seen, merely reduce the unit interval length of TTI, still can not fundamentally reduce response time at interval for sending data.
For this reason; the applicant draws: in order to reduce response time at interval, except reducing the time span of TTI, also need to adopt other measures: the frame structure to the TDD system improves; so that in same subframe, increase the number of protection time slot, and then reduce response time at interval.
See also Fig. 3, it is the flow chart of the communication means of a kind of time division duplex mobile communication system disclosed by the invention.It may further comprise the steps:
S110: least unit and the system frame structure of Transmission Time Interval TTI are set, and each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and TTI is to be least unit with the business time-slot;
S120: transmitting terminal will need the packet that sends to encode, modulate the back according to the frame structure that step S110 sets to send by radio frequency;
S130: elder generation's demodulation of receiving terminal received RF signal and the corresponding packet of setting according to step S110 of frame structure decoding back acquisition, the TTI unit that sets according to step S110 returns the reception response message then, so that transmitting terminal sends next packet, and then finish transfer of data.
See also Fig. 4, it is the improved TDD of the present invention frame structure schematic diagram.In Fig. 4, in order to keep backwards compatibility, the length of a frame still is 10ms, and each frame is made up of the wireless sub-frame of two 5ms.Each wireless sub-frame is made up of N time slot and a plurality of special time slot.Special time slot comprises two and above protection time slot GP at least.Special time slot can also comprise a DwPTS and a UpPTS, also can also comprise a DwPTS.In new subframe, the effect of special time slot is identical with former subframe in the new subframe.If there is descending pilot frequency time slot, then this time slot is used for the transmission of the down-going synchronous information of system, otherwise sends descending pilot frequency information by the downlink business time slot.If there is uplink pilot time slot, then this time slot is used for the uplink synchronous information that the user inserts and sends, otherwise the ascending pilot frequency that sends by the uplink service time slot, the protection time slot is used to provide the slot time of descending sending time slots to up sending time slots conversion.
Increased the number of protection time slot GP in the frame structure that the present invention sets.The protection time slot is to be used for the protection interval of descending time slot to the ascending time slot conversion in the TDD system.Because the quantity of having set up GP in each subframe owing to reduced the least unit of TTI, has reduced the time interval of echo reply message again, and then reach the effect that reduces data transmission delay.And the present invention can set the number of protection time slot according to system to the requirement of replying time interval time delay: by descending a GP is set all between the time point of up conversion such as each.The number M of protection time slot satisfies
N is a business time-slot number in each subframe.
In subframe structure of the present invention, increase the number of business time-slot.Along with people are more and more higher to the requirement of communication system, the data of network side and user terminal transmission are also more and more.Such as, people have been not content with the computer technology network by family, but wish to realize can both accepting in any place to carry out data services such as network browsing such as send Email.Therefore, the development of communication system also progressively by the system of simple service speech to the system development of supporting high-speed data.In subframe structure of the present invention, improve the efficient of transmission data by the number of setting up business time-slot.Each subframe number of time slot is N now, and satisfies inequality N 〉=7.In order to support business, therefore, number of time slot N is set for greater than 7 odd number as uplink and downlink traffic carrying capacity symmetries such as Speech Communication, video telephone communications.
Simultaneously, consider that the up-downgoing pilot time slot mainly is to be used for UE and network side to set up synchronously.In order to reduce interference, in subframe structure of the present invention, if having descending pilot frequency time slot and uplink pilot time slot, two special time slots can be that all period interval send by the experimental process frame number.That is: the information in DwPTS and the UpPTS time slot can all send in each subframe, can be that all period interval send by certain number of sub frames also.When the information of DwPTS and UpPTS time slot is all period interval when sending by certain number of sub frames, both can send in same subframe simultaneously, also can send in different subframes.DwPTS can be identical with the cycle of UpPTS gap information transmission, also can be different.
In the subframe structure of setting, time slot TS0 still is fixed as descending time slot, and time slot TS1 still is fixed as ascending time slot.And the minimum interval of adjacent two protections between time slots is set is 2 business time-slots, and also has a business time-slot at least after last protection time slot in subframe.
Also have; descending pilot frequency time slot, protection time slot and uplink pilot time slot are adjacent time slot in the prior art; in transmission course, exist stronger interference between the up-downgoing pilot time slot; for this reason; in the improved subframe structure of the present invention; if there is a up and descending pilot frequency time slot simultaneously, the up-downgoing pilot time slot can be separated on the position.Such as descending pilot frequency time slot (DwPTS) also being arranged on after the TS0, uplink pilot time slot is positioned at after K the protection time slot, M＞=K＞1, and M be a number of protecting time slot in each subframe.
Below be example with the transmission of packet data, specify the data communication of TDD system.Suppose that network terminal has data to send to UE end, the data traffic transmission of network terminal is behind the TCP layer, and network terminal is set up a slip send window at the TCP layer, and the size of this window is by the storage capacity of transmitting terminal and type of service decision.The TCP layer sends to the PDCP layer that the IP layer carries out sending to behind route and the related work RAN system with data.The PDCP layer carries out the compression of IP head, and packet carried out being delivered to rlc layer after the segmentation, and be transferred to the MAC layer by rlc layer, through arriving the data of physical layer after the relevant treatment of rlc layer and MAC layer, physical layer is carried out sending to radio frequency behind respective coding, modulation and the beam forming and is sent sending data according to the setting of step S110.
After wireless transmission, UE receives radiofrequency signal, after the respective handling of physical layer, MAC layer, rlc layer and the PDCP layer of process local terminal, arrive the IP layer, and by being delivered to the TCP layer after the IP processing, if the TCP layer correctly receives the packet of transmitting terminal, will send one to network layer by channel and receive response message, and will receive packet data delivery and send to application layer.
, sequential delivery reliable in order to guarantee, network terminal must be in to the packet that UE sends and send in the sliding window, receive the reception response message of UE when network termination after, sliding window is to front slide, the data that newly enter window will be sent out.All do not sent if receive the response message of UE and send the interior packet of sliding window, then network terminal is understood wait acknowledge message and is no longer sent data.If wait for that the response message that receives is overtime, network terminal will abandon this grouping.Send data to UE from network terminal, and by UE return receive response message be called propagation delay time during this period of time.A call throughput (CallThroughout) of transmitting terminal sends the size and the propagation delay time decision of sliding window by transmitting terminal, and satisfies with lower inequality (1):
Call Throughout≤Send_window?size/delay (1)
Be that call throughput is by sending sliding window size and propagation delay time decision.
In the superincumbent description, as can be seen, under the certain condition of sliding window, the size of calling out throughput is determined by propagation delay time.In the mobile communication transmission, TTI has determined the processing time length of transmitting terminal, the processing time length of transmitting time length and receiving terminal.These time spans are directly proportional with TTI, and TTI is more little, and time span is short more, and time delay is more little, and in finite time, call throughput is big more.
At existing TD-SCDMA system, its communication means is (seeing also Fig. 5):
S210: least unit and the system frame structure of Transmission Time Interval TTI are set, and each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and TTI is to be least unit with the business time-slot.
S220: user terminal foundation earlier is synchronous with network side, passes through to receive the TS0 time slot then, the broadcast that acquisition is sent by network side, and then get its configuration information, described configuration information comprises the TTI and the system-frame information of step S210 setting.
If there is descending pilot frequency time slot among the step S220 in the subframe, user terminal by receive descending pilot frequency time slot set up with network side synchronously, otherwise will set up synchronous with network side by the information on the downlink business time slot.
User terminal is by receiving the information of descending pilot frequency time slot, and foundation is synchronous with network side.Descending pilot frequency time slot is arranged on after the TS0 time slot of subframe usually, even if descending pilot frequency time slot is to be when sending in the cycle with several subframes, user terminal also can be from the information of acquisition descending pilot frequency time slot behind the TS0 time slot of subframe by the reception of several subframes.Then, user terminal can obtain broadcast on the TS0 time slot according to the position of descending pilot frequency time slot, carries out the corresponding configuration of local terminal.
If there is no independent descending pilot frequency time slot, network terminal can send corresponding pilot frequency information by the fixed channel of certain fixing downlink business time slot, this pilot frequency information can make equally terminal UE catch and carry out with network terminal synchronously.
Equally, in the terminal UE access procedure, if there is no independent uplink pilot time slot, UE can distribute by network side certain fixedly the fixed channel of uplink service time slot send uplink synchronous information, and then realize uplink synchronous with network terminal.
S230: network side/user terminal sends call information to the opposite end, and call answering is carried out according to the TTI that step S210 sets in the opposite end.For downlink business, be that network side sends call information to user terminal.For uplink service, be that user terminal sends call information to network side.Still be that example illustrates its process with the downlink business, when network side will send data to UE, network terminal sends the call information of calling out this UE by the channel on the TS0 time slot, UE can decode to the information that receives according to the subframe structure that network side adopts, obtain call information after the demodulation, if there is ascending pilot channel in subframe, terminal sends random access information to network terminal at next uplink pilot time slot, otherwise terminal sends random access information to network terminal by the uplink service time slot.Network terminal receives information according to the subframe structure of setting, and behind the acquisition random accessing message, sends control corresponding message (comprising some access controls) to UE, and same, UE can return corresponding response message.
S240: network side is to the user terminal allocation of channel resources may, and network side is set up by described allotted channel resource with user terminal and communicated by letter.Network side and user terminal are set up communicate by letter by described allotted channel resource and specifically comprised: a1: transmitting terminal will need the data that send to encode, modulate and then send by radio frequency according to the frame structure that step S210 sets; Elder generation's demodulation of a2 receiving terminal received RF signal and the corresponding packet of setting according to step S210 of frame structure decoding back acquisition, the TTI unit that sets according to step S210 returns the reception response message then, so that transmitting terminal sends next data, and then finish transfer of data.
From the above, when network side and UE set up data communication, very frequent during between the two mutual.Mutual each time, all need decode according to the subframe structure of setting, reduce the unit interval length of TTI, can reduce the mutual time interval, improve the speed of transfer of data thus.
Below introduce the subframe structure setting of step S210.Increased the number of protection time slot GP in the frame structure that the present invention sets.The protection time slot is to be used for the protection interval of descending time slot to the ascending time slot conversion in the TDD system.Because the quantity of having set up GP in each subframe owing to reduced the least unit of TTI, has reduced the time interval of echo reply message again, and then reach the effect that reduces data transmission delay.And the present invention can set the number of protection time slot according to system to the requirement of replying time interval time delay: by descending a GP is set all between the point of up conversion such as each.The number M of protection time slot satisfies
N is a business time-slot number in each subframe.
In subframe structure of the present invention, increase the number of business time-slot.Along with people are more and more higher to the requirement of communication system, the data of network side and user terminal transmission are also more and more.Such as, people have been not content with the computer technology network by family, but wish to realize can both accepting in any place to carry out data services such as network browsing such as send Email.Therefore, the development of communication system also progressively by the system of simple service speech to the system development of supporting high-speed data.In subframe structure of the present invention, improve the efficient of transmission data by the number of setting up business time-slot.Each subframe number of time slot is N now, and satisfies inequality N 〉=7.In order to support business, therefore, number of time slot N is set for greater than 7 odd number as uplink and downlink traffic carrying capacity symmetries such as Speech Communication, video telephone communications.
Simultaneously, consider that the up-downgoing pilot time slot mainly is to be used for UE and network side to set up synchronously.In order to reduce interference, in subframe structure of the present invention, if there is the uplink and downlink pilot channel in the subframe, descending pilot frequency time slot and uplink pilot time slot can be that all period interval send by the experimental process frame number.That is: the information in DwPTS and the UpPTS time slot can all send in each subframe, can be that all period interval send by certain number of sub frames also.When the information of DwPTS and UpPTS time slot is all period interval when sending by certain number of sub frames, both can send in same subframe simultaneously, also can send in different subframes.DwPTS can be identical with the cycle of UpPTS gap information transmission, also can be different.
In the subframe structure of setting, time slot TS0 still is fixed as descending time slot, and time slot TS1 still is fixed as ascending time slot.And the minimum interval of adjacent two protections between time slots is set is 2 business time-slots, and also has a business time-slot at least after last protection time slot in subframe.
Also have; descending pilot frequency time slot, protection time slot and uplink pilot time slot are adjacent time slot in the prior art, exist stronger interference between the up-downgoing pilot time slot in transmission course, for this reason; in the improved subframe structure of the present invention, the up-downgoing pilot time slot can be separated on the position.Such as descending pilot frequency time slot (DwPTS) also being arranged on after the TS0, uplink pilot time slot is positioned at after K the protection time slot, M＞=K＞1, and M be a number of protecting time slot in each subframe.
See also Fig. 6, it is for the topology example of the improved subframe of the present invention.Subframe has comprised 9 time slots and 4 special time slots altogether.4 special time slots are a DwPTS, UpPTS and two translation and protection time slot GP1 and GP2.In this subframe,,, can reduce data transmission delay, improve power system capacity along with the length minimizing of time slot, the increase of protection time slot GP if TTI is a length with a time slot.Simultaneously, owing to increased DwPTS and UpPTS slot time, can reduce the synchronous interference of up-downgoing.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (12)
1, a kind of communication means of time division duplex mobile communication system is characterized in that, comprising:
(1) least unit and the system frame structure of Transmission Time Interval TTI are set, each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and described TTI is to be least unit with a business time-slot in the described wireless sub-frame;
(2) the transmitting terminal frame structure that will need the data that send to set according to step (1) is encoded, is modulated the back and sends by radio frequency;
(3) receiving terminal received RF signal elder generation demodulation, the frame structure decoding back of setting according to step (1) then obtain corresponding data, the TTI that sets according to step (1) returns the reception response message subsequently, so that transmitting terminal sends next packet, and then finish transfer of data.
2, the communication means of time division duplex mobile communication system as claimed in claim 1 is characterized in that, step (1) is according to system the number of translation and protection time slot to be set in the requirement of replying time interval time delay, and described number M satisfies
N is a business time-slot number in each subframe.
3, the communication means of time division duplex mobile communication system as claimed in claim 1, it is characterized in that, the special time slot of setting in the step (1) also comprises a uplink pilot time slot UpPTS and a descending pilot frequency time slot DwPTS, UpPTS that sets and DwPTS are that all period interval send with the experimental process frame number, perhaps
The special time slot that step (1) is set also comprises a DwPTS, and the DwPTS of setting is that all period interval send with the experimental process frame number.
4; communication means as claim 1 or 3 described time division duplex mobile communication systems; it is characterized in that; in the subframe structure that step (1) is set; time slot TS0 is a descending time slot; time slot TS 1 is an ascending time slot; minimum interval between adjacent two translation and protection time slots is 2 business time-slots; and also has a business time-slot in the subframe after last translation and protection time slot at least; if there is DwPTS in the subframe; then this DwPTS is positioned at after the time slot TS0, if there is UpPTS in the subframe, this UpPTS is positioned at after K the translation and protection time slot; M 〉=K＞1, M is the number of translation and protection time slot in each subframe.
5, the communication means of time division duplex mobile communication system as claimed in claim 1 is characterized in that, sets the number of business time-slot in each subframe more than or equal to 7 in step (1).
6, the communication means of time division duplex mobile communication system as claimed in claim 1,
Step (2) also comprises before: transmitting terminal is set up a slip send window, and the data that need to send are positioned at the transmission sliding window;
Step (3) also comprises: if transmitting terminal receives the reception response message that receiving terminal returns in the predefined time, sliding window is to front slide, and the data that newly enter sliding window send as next pre-data that send.
7, a kind of communication means of time division duplex mobile communication system is characterized in that, comprising:
(1) least unit and the system frame structure of Transmission Time Interval TTI are set, each wireless sub-frame is made up of several business time-slots and the special time slot that comprises two translation and protection time slots at least, and described TTI is to be least unit with one business time-slot in the described wireless sub-frame;
(2) user terminal set up earlier with network side synchronously, then by receiving the TS0 time slot, obtain the broadcast that sends by network side, and then obtain its configuration information, described configuration information comprises TTI and the system-frame information that step (1) is set;
(3) network side/user terminal sends call information to the opposite end, and the TTI that the opposite end is set according to step (1) carries out call answering;
(4) network side is to the user terminal allocation of channel resources may, and network side is set up by described allotted channel resource with user terminal and communicated by letter.
8, the communication means of time division duplex mobile communication system as claimed in claim 7 is characterized in that, step (1) is according to system the number of translation and protection time slot to be set in the requirement of replying time interval time delay, and described number M satisfies
N is a business time-slot number in each subframe.
9, the communication means of time division duplex mobile communication system as claimed in claim 7, it is characterized in that, the special time slot of setting in the step (1) also comprises a uplink pilot time slot UpPTS and a descending pilot frequency time slot DwPTS, UpPTS that sets and DwPTS are that all period interval send with the experimental process frame number, perhaps
The special time slot that step (1) is set also comprises a DwPTS, and the DwPTS of setting is that all period interval send with the experimental process frame number.
10; communication means as claim 7 or 9 described time division duplex mobile communication systems; it is characterized in that; in the subframe structure that step (1) is set; time slot TS0 is a descending time slot; time slot TS 1 is an ascending time slot; minimum interval between adjacent two translation and protection time slots is 2 business time-slots; and also has a business time-slot in the subframe after last translation and protection time slot at least; if there is uplink pilot time slot; then described uplink pilot time slot is positioned at after K the translation and protection time slot; M 〉=K＞1, M is the number of translation and protection time slot in each subframe.
11, as the communication means of claim 7 or 9 described time division duplex mobile communication systems, it is characterized in that,
Step (2) if in have descending pilot frequency time slot in the subframe, user terminal by receive descending pilot frequency time slot set up with network side synchronously, otherwise will set up synchronous with network side by the information on the downlink business time slot.
12, the communication means of time division duplex mobile communication system as claimed in claim 7 is characterized in that, network side is set up to communicate by letter by described allotted channel resource with user terminal and specifically comprised in the step (4):
The frame structure that transmitting terminal will need the data that send to set according to step (1) is encoded, is modulated the back and sends by radio frequency;
Elder generation's demodulation of receiving terminal received RF signal and the corresponding packet of setting according to step (1) of frame structure decoding back acquisition, the TTI unit that sets according to step (1) returns the reception response message then, so that transmitting terminal sends next data, and then finish transfer of data.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8767697B2 (en) | 2007-09-14 | 2014-07-01 | Telefonaktiebolaget L M Ericsson (Publ) | TDD time slot splitting |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| EP2026477A1 (en) * | 2007-08-14 | 2009-02-18 | Nokia Corporation | Radio communication system and method for coding data |
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-
2005
- 2005-06-09 CN CNB2005100769221A patent/CN100566214C/en active Active
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