CN1909691B - Wireless telecommunication system including at least a base station intended to communicate with terminals - Google Patents
Wireless telecommunication system including at least a base station intended to communicate with terminals Download PDFInfo
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- CN1909691B CN1909691B CN2006101061864A CN200610106186A CN1909691B CN 1909691 B CN1909691 B CN 1909691B CN 2006101061864 A CN2006101061864 A CN 2006101061864A CN 200610106186 A CN200610106186 A CN 200610106186A CN 1909691 B CN1909691 B CN 1909691B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
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Abstract
The present invention concerns a wireless telecommunication system including at least a base station intended to communicate with terminals over bidirectional communication channels, each channel supporting frames being divided into downlink timeslots and uplink timeslots, each downlink timeslot including a number of symbols intended to be transmitted to at least a terminal, a terminal after having received all the symbols included in a downlink timeslot followed by an uplink timeslot transmits other symbols over said uplink timeslot with a time delay depending on the distance between said terminal and said base station so that the so transmitted symbols are received by said base station at a time separated from the end of the transmission by the base station of the downlink timeslot by a predefined guard period constant whatever said distance.
Description
Technical field
The present invention relates to a kind of radio telecommunications system, described radio telecommunications system comprises that at least one is used for the base station that communicates with terminal on bi-directional communication channel.
Background technology
Notice that radio telecommunications system comprises mobile communication system, wherein portable terminal can move on long distance and fast moving sometimes in described mobile communication system; And comprise some telecommunication systems, wherein be fixed or only on distance short for base station that described terminal is connected, to move and very slow movably usually in terminal in these telecommunication systems.
Fig. 1 shows the wireless cellular telecommunication system that the base station is served with diagram method, at this two base station BTS 1 and BTS2 are arranged, each base station is used for and at least one terminal communication, at this two terminal TE1 and TE2 is arranged, and it is communicated by letter with base station BTS 1 on radio communication channel CH1 and CH2 respectively.In Fig. 1, terminal TE1 is d1 apart from the distance of base station BTS 1, and terminal TE2 is d2 apart from the distance of base station BTS 1.The zone that base station BTS covered is commonly referred to the sub-district, and the border of described sub-district is to be considered to the distance of peaked base station.
Each channel CHi (i=1,2) is used for supporting information is sent to the up link ULi of base station BTS and the down link DLi that information is sent to terminal TEi from base station BTS from terminal TEi.Described information is sealed in the frame, and described frame is divided into or distributes to up link ULi or distribute to the time slot of down link DLi.
Described frame for example is the type described in Fig. 2, and promptly the HD/OFDM type (is represented half-duplex/OFDM/OFDM), perhaps TDD/OFDM (time division duplex/OFDM) or FDD/OFDM (Frequency Division Duplexing (FDD)).As what see in Fig. 2, this frame is subdivided into integer L time slot TS1-TSL, and they can be assigned to up link DL or be assigned to down link UL.In addition, each time slot TSj (j=1 is to L) supports to be called the q of OFDM code element
jIndividual code element s1-sq
j(at this, for time slot TSj, q
j=8), described code element is carried by k quadrature modulation frequency f 1-fk respectively.Note each the OFDM code element s1-sq among the time slot TSj
jGenerally include Cyclic Prefix, described Cyclic Prefix is used to resist inter symbol interference.
It should be understood that the number of symbols of each time slot can change to another time slot from a time slot under normal conditions.
About Fig. 3, consider q on time te
j=8 code element s1-s8 are by the transmission of base station BTS on down link DL.The time equal te+RTD (dref)/2 when (RTD (dref) postpones at the described distance of the distance base station BTS round trip by the described terminal TEref of dref) by on the border of consideration sub-district the terminal TEref of (distance at the distance base station BTS is on the dref) receive these code elements s1-s8.These code elements of described terminal processes, described then terminal is transmitted symbol on up link UL also.Before transmitting on the up link, terminal must be waited for a time cycle, and promptly described reception transmission switching time or simple switching time and be called as RTS are so that consider the duration of hardware and software operation.For example, this postpone RTS be terminal hardware device receive and transmission between switch needed time and base station hardware device in transmission with switch the maximum of needed time between receiving.Equal te+RTD (dref)+RTS+D at time tr
DL(D
DLBe q
jThe total duration of individual code element) time, is received in the code element of being transmitted on the up link UL at the base station BTS place.Therefore it can be seen that base station BTS must be waited for and receive code element that the terminal that is positioned at the cell boarder place transmits so that carry out its processing.Stand-by period is called protection period GP, and must equal round trip at least and postpone RTD (dref) and add and receive transmission RTS switching time.
In Fig. 2, can see the protection period GP between down link DL and the up link UL.
For those terminals than a top more close base station BTS of TEref of considering, constant time lag TD (d) is determined and is applied to the transmission of code element on up link UL usually like this, makes to receive the code element of being transmitted from all terminal TE that are connected with described base station at identical time tr on base station BTS.In other words, protection period GP is a constant, regardless of the distance that the terminal of being considered and base station BTS are separated.
Notice that in the literature, the notion of timing advance TA is well-known.GP can interrelate aforesaid constant time lag TD and timing advance TA by the consideration protection period, and is as follows:
TA＝GP-TD
As previously mentioned, the problem that telecommunication system solved relates to caused due to the fact that resource potential loss, promptly is transmitted without any kinds of information during protection period GP.
Notice that for very big sub-district, the duration of protection period can be greater than the q of a time slot
jThe duration of individual code element.
Summary of the invention
The present invention is intended to by providing a kind of radio telecommunications system to solve the problems referred to above, and described radio telecommunications system comprises be used for the base station that communicates with terminal that on bi-directional communication channel described system is such so that can use resource preferably.
Therefore; the present invention relates to a kind of radio telecommunications system; described radio telecommunications system comprises that at least one is used for the base station that communicates with terminal on bi-directional communication channel; each channel support is divided into the frame of downlink time slots and uplink time slot; each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal; terminal is transmitted other code elements on uplink time slot after having received all code elements that are included in the downlink time slots; after the described downlink time slots is uplink time slot; described transmission has the time delay that depends on distance between described terminal and the described base station so that so the code element of transmission is received by described base station on such time; the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by; and no matter described distance how; it is characterized in that the base station comprises is used for during protection period at least one assisted downlink code element being transferred to the device that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or being used for during protection period receiving the device of at least one auxiliary uplink symbols of self terminal, described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
Radio telecommunications system according to the present invention comprises:
-be used for determining the device of the time delay of connected each terminal;
-be used to allow the base station to incite somebody to action n at the most
D1It is the device of the terminal of d that individual assisted downlink code element is transferred to apart from the distance of base station, and the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-be used to allow described terminal to receive and handle described n
D1The device of individual assisted downlink code element.
Described radio telecommunications system also comprises:
-be used for determining the device of the time delay of connected each terminal;
-to be used to allow apart from the distance of base station be the terminal transmission n at the most of d
U1The device of individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-be used to allow described base station to receive and handle described n at the most
U1The device of individual auxiliary uplink symbols.
According to an aspect of the present invention, being used for determining apart from the distance of base station is that the device of time delay of the terminal of d comprises and is used for the protection period value is deducted the device that the round trip of described terminal postpones RTD (d) value.Advantageously, postpone RTD (dref) value by the round trip that is used for terminal and add that RTS switching time from the receiving mode to the transmission mode provides the protection period value, described terminal is on the predetermined reference range dref of the base station of being considered.
According to an aspect of the present invention, described radio telecommunications system comprises the device that is used to notify the time delay that connected each terminal must use about described terminal.
According to an aspect of the present invention, as long as be not identified for the time delay of terminal, then at least one assisted downlink code element, do not comprise information.
According to an aspect of the present invention, as long as be not identified for the time delay of terminal, the time delay that then is used for described terminal is considered to equal protection period.
According to an aspect of the present invention, described base station is used for modulation, coding and/or the multiplexing scheme of at least one assisted downlink code element, described scheme is different from the employed scheme of code element that the base station is the benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one assisted downlink code element with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
According to an aspect of the present invention, the base station is included in the specific control information relevant with described assisted downlink code element in the assisted downlink code element.
The invention still further relates to the base station of radio telecommunications system, described base station is used for communicating on bi-directional communication channel with terminal, each channel support is divided into the frame of downlink time slots and uplink time slot, and each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal.
According to the present invention, described base station comprises:
-be used for determining the device of the time delay of connected each terminal, described time delay is such so that any terminal is transmitted other code elements on uplink time slot after having received all code elements that are included in the downlink time slots, after the described downlink time slots is described uplink time slot, described transmission has the described time delay that depends on distance between described terminal and the described base station and is received by described base station on such time with the code element that toilet transmits, the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by, and no matter described distance how;
-be used for during protection period, at least one assisted downlink code element being transferred to the device that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or being used for during protection period receiving the device of at least one auxiliary uplink symbols of self terminal, described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
According to an aspect of the present invention, described base station BTS comprises that the distance that is used for to the distance base station is the terminal transmission n at the most of d
D1The device of individual assisted downlink code element, the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS.
According to an aspect of the present invention, described base station BTS comprises that being used for from the distance of distance base station is that the terminal of d receives to many n
U1The device of individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS.
According to an aspect of the present invention, described base station comprises the device that is used to notify the time delay that connected each terminal must use about described terminal.
According to an aspect of the present invention, described base station is used for modulation, coding and/or the multiplexing scheme of at least one assisted downlink code element, described scheme is different from the employed scheme of code element that described base station is the benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one assisted downlink code element with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
According to an aspect of the present invention, described terminal is included in the specific control information relevant with described assisted downlink code element in the assisted downlink code element.
The invention still further relates to the terminal of aforesaid radio telecommunications system, it is characterized in that described terminal comprises the device that is used for receiving and handling at its time timing period at least one assisted downlink code element.
According to an aspect of the present invention, described terminal comprises the number n that is used for determining according to the time-delay value that terminal must be used the auxiliary symbol down link that described terminal must receive and handle
D1Device.
The invention still further relates to the terminal of aforesaid radio telecommunications system, it is characterized in that described terminal comprises the device that is used for transmitting at its time timing period at least one auxiliary uplink symbols.
According to an aspect of the present invention, described terminal comprises the number n that is used for determining according to the time-delay value that terminal must be used the auxiliary uplink symbols that terminal must be transmitted during the described time delay cycle
U1Device.
In addition, the present invention relates to the transmission method in radio telecommunications system, described radio telecommunications system comprises that at least one is used for the base station that communicates with terminal on bi-directional communication channel, each channel support is divided into the frame of downlink time slots and uplink time slot, each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal, said method comprising the steps of:
To be included in code element in the downlink time slots from the base station transmits to the terminal;
Each terminal receives the code element that is included in the described downlink time slots;
Other code elements of each terminal transmission on uplink time slot subsequently; described transmission has the time delay that depends on distance between described terminal and the described base station so that so the code element of transmission is received by described base station on such time; the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by, and no matter described distance how.
According to the present invention; described method is included in the protection period base stations during and at least one assisted downlink code element is transferred to the step that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or described base station receives the step of at least one auxiliary uplink symbols of self terminal during protection period, and described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
According to an aspect of the present invention, said method comprising the steps of:
The time delay of-definite each terminal that is connected with the base station;
The described base station of-permission is n at the most
D1It is the terminal of d that individual assisted downlink code element is transferred to apart from the distance of base station, and the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-allow described terminal to receive and handle described n
D1Individual assisted downlink code element.
According to an aspect of the present invention, said method comprising the steps of:
The time delay of-definite each terminal that is connected with the base station;
-to allow apart from the distance of base station be the terminal transmission n at the most of d
U1Individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-allow described base station to receive described n at the most
U1Individual auxiliary uplink symbols.
According to an aspect of the present invention, described method comprises the step of notifying the time delay that connected each terminal must use about described terminal.
According to an aspect of the present invention, described method comprises the step of the modulation, coding and/or the multiplexing scheme that are used at least one assisted downlink code element, described scheme is different from and is the employed scheme of the code element of benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one assisted downlink code element with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
According to an aspect of the present invention, in an auxiliary symbol, comprise the specific control information relevant with this auxiliary symbol.
Description of drawings
Reading describes below characteristic and other aspects that will be clear that the invention described above more about what accompanying drawing provided, in the accompanying drawings:
Fig. 1 is a schematic diagram of describing telecommunication system, and wherein the method according to this invention will advantageously be used to transmission information;
Fig. 2 is a chronogram of describing the structure of traditional HD/OFDM frame;
Fig. 3 is a chronogram of describing the information of transmitting according to prior art in the down link of telecommunication system;
Fig. 4 is a chronogram of describing according to the present invention transmission information in the down link of telecommunication system;
Fig. 5 is a chronogram of describing according to another embodiment of the present invention transmission information in the down link of telecommunication system and up link; And
Fig. 6 is a chronogram of describing according to another embodiment of the present invention transmission information in the down link of telecommunication system and up link.
Embodiment
According to describing accompanying drawing of the present invention, the code element that is transmitted is represented with fine rule, and received code element is represented with thicker line.
The present invention can realize by a kind of radio telecommunications system, as the telecommunication system described in Fig. 1, and use the frame of half-duplex (HD) type as shown in Figure 2, for example TDD type or HD/FDD, wherein terminal different frequency bands and also during different time-gap transmission and received signal.
In two kinds of situations of TDD and HD FDD system, as will be seen, between down link and uplink time slot, need protection the cycle, and can use timing advance similarly.Therefore, the present invention also is applicable to HD FDD.
Yet, notice that in FDD, parallel communications can be carried out with terminal with full duplex (FD) ability (wherein not using the present invention) and the terminal (wherein using the present invention really) with half-duplex (HD) ability in the base station.For each HD-FDD terminal, described base station has to only utilize a suitable scheduling mechanism to guarantee to be regardless of in the identical time cycle to mix line link time slot (on uplink band) and downlink time slots (on downlink band).
Now, about Fig. 4, consider on down link DL, to transmit q by base station BTS being called on the time of te
j(for clearness, q
j=7) (be formed on the benchmark time slot that this names, described benchmark time slot comprises and equals benchmark number n individual code element s1-s7
RefA plurality of code elements).As what explain in the preorder of this specification; after last downlink symbol s7 of transmission benchmark time slot; base station BTS must be waited for one-period, and promptly GP is up to time tr the so-called protection cycle, with all the terminal receiving uplink code elements from being connected with described base station.To be called corresponding to the benchmark number be n the duration of benchmark time slot in down link
RefThe Dref of individual (for example, 7) code element.
Can determine the duration of protection period GP in following mode.Apart from base station BTS is that the terminal TEref (for example on the border of sub-district) of reference range dref receives the downlink symbol s1-s7 by the downlink reference time slot that base station BTS transmitted, and described reception has a delay of 1/2 that equals to postpone apart from the round trip of dref corresponding to described downlink reference RTD (dref).Switch to transmission mode (handover operation continues RTS) afterwards at all downlink symbol s1-s7 that received the downlink reference time slot and from receiving mode, terminal is transmitted the uplink symbols shown in fine rule on up link UL, receive described uplink symbols in a delay on base station BTS, described delay also equals to postpone 1/2 of RTD (dref) corresponding to the round trip of reference range dref.Therefore, can determine time tr in following mode:
tr＝te+Dref+RTD(dref)+RTS
The duration of protection period GP then equals:
GP＝RTD(dref)+RTS
Notice that protection period GP is with irrelevant apart from d.It is predefined and is constant, and though terminal TE and base station BTS apart from d how.
Apart from the distance of base station BTS is that the terminal TE of d receives the downlink symbol s1-s7 by the benchmark time slot that base station BTS transmitted, and described reception has a delay of 1/2 that equals to postpone corresponding to described round trip apart from d RTD (d).After receiving all downlink symbol of benchmark time slot, it such time tt transmit on the up link UL so that thereby the uplink symbols of being transmitted on aforementioned time tr, be received, described reception has a length of delay of 1/2 that equals to postpone corresponding to described round trip apart from d RTD (d).Can be expressed as follows in the reception of the end of benchmark time slot and the time delay period T D (d) between the transmission of up link UL:
TD(d)＝tr-te-Dref-RTD(d)＝GP-RTD(d)
Notice that time delay TD (d) depends on that apart from d long more apart from d, time delay TD (d) is more little.
Same attention, for example based on pilot signal that corresponding terminal transmitted and by inferring that from the feature of described pilot signal the round trip of corresponding terminal postpones RTD (d), can determine the time delay TD (d) of each terminal of being connected with base station BTS by base station BTS.
According to the present invention, a kind of base station is provided, to comprise the assisted downlink code element in downlink time slots, described assisted downlink code element is used for only being transferred to and can receives and handle their terminal during its corresponding time delay.
According to a further aspect in the invention, if be the terminal of d, at n for the distance of distance base station BTS
D1The duration of individual downlink symbol adds RTS and n switching time
D1The duration of+1 downlink symbol adds and comprises time delay TD (d) between RTS switching time, then base station BTS can for described terminal at n
D1Insertion information in the individual assisted downlink code element.This condition can be written as on the mathematics:
If n
Dl.ts
Dl≤ TD (d)-RTS＜(n
Dl+ 1) ts
Dl, then be inserted into many n
D1Individual auxiliary symbol.
Ts
D1It is the duration of a downlink symbol.
When being that terminal TE is at n
D1When inserting information in the individual assisted downlink code element, base station BTS indicates this insertion (passing through signaling) so that described terminal TE reads and handle these n to described terminal TE
D1Individual auxiliary symbol is together with other code elements.
For example, base station BTS is notified the time delay TD that connected each terminal TE must use about it.Then, each terminal TE infers the number of symbols that it must read and handle by using above-mentioned expression formula from time delay TD value.
Therefore, determine the number n of assisted downlink code element in following mode
D1, the base station can be with described n
D1It is the terminal TE of d that individual assisted downlink symbol allocation is given apart from the distance of base station BTS:
n
dl＝integer{(TD(d)-RTS)/ts
dl}＝integer{(GP-RTD(d)-RTS)/ts
dl}
For the distance of distance base station BTS be zero and to postpone RTD at its round trip be that zero terminal TE provides maximum number N
DlMax auxiliary symbol:
N
dlmax＝integer{(GP-RTS)/ts
dl}
In the situation described in Fig. 4, because number N
DlMax is 2; so the total number of the downlink symbol of being transmitted is 9 now: the downlink symbol s1-s7 of benchmark time slot and 2 assisted downlink code element s8 and s9 (cross hatch), described assisted downlink code element was transmitted in the cycle that it has been generally acknowledged that protection period GP.For the terminal TEref on reference range dref (distance equals cell boarder usually), according to the definition of time delay, the value of time delay TD (dref) equals RTS switching time.Base station BTS is only distributed to described terminal TEref with 7 downlink symbol s1-s7 of described benchmark time slot.Terminal TEref only reads and handles this 7 downlink symbol s1-s7, if auxiliary symbol is arranged, then described 2 auxiliary symbol s8 and s9 are left in the basket.
Add switching time for time delay TD (d1) value of terminal TE1 less than duration of two downlink symbol, but the duration that equals a downlink symbol adds RTS switching time.Therefore, (at this is downlink symbol s8 in assisted downlink code element at the most, it follows last downlink symbol s7 of benchmark time slot closely), base station BTS can be with message transmission to described terminal TE1, and described assisted downlink code element is at the most read and handles by described terminal TE1.If code element s9 is arranged, then described terminal TE1 ignores code element s9.In this case, the total number that can comprise the downlink symbol of the information that is used for described terminal TE1 is 8 (7 downlink symbol s1-s7 of benchmark time slot add an auxiliary symbol s8).
The duration that equals two downlink symbol for time delay TD (d2) value of terminal TE2 adds RTS switching time.Therefore, benchmark BTS can be in 2 assisted downlink code element s8 and s9 at the most with message transmission to described terminal TE2, described two assisted downlink code elements are at the most read and handle by described terminal TE2.The downlink symbol sum that comprises the information that is used for described terminal TE2 is 9 (7 downlink symbol s1-s7 of benchmark time slot add 2 assisted downlink code element s8 and s9).
Base station BTS can be any terminal TE of d to the distance apart from the base station with message transmission, described apart from d be included in terminal TE1 apart from d1 and terminal TE2 apart between the d2, described transmission has 8 downlink symbol at the most that described terminal can read and handle.In an identical manner, base station BTS can in 9 downlink symbol arrive message transmission apart from any terminal apart from d2 of d less than terminal TE2 at the most, and described terminal can read and handle described 9 downlink symbol at the most.Usually in an identical manner, base station BTS can in 7 code elements arrive message transmission apart from any terminal apart from d1 of d greater than terminal TE1 at the most, and described terminal can read and handle described 7 code elements at the most.
Notice that downlink symbol s8 only comprises at the distance of the distance base station BTS terminal information less than d1, and downlink symbol s9 only comprises at the distance of the distance base station BTS terminal information less than d2.
Notice that said process is a dynamic process, this meaning can be revised distribution in described time course.Because terminal changes its position with respect to base station BTS, this can be such situation: it can from wherein be used for described terminal information comprised that the position of n assisted downlink code element at the most moves to wherein said information can be in the m (position in the individual assisted downlink code element of m ≠ n).
When terminal connects, do not receive the information that it must be used about time delay TD.Short of receiving, the number of symbols of then distributing to this terminal equals benchmark number n
RefIn addition, equal benchmark number n having received
RefA plurality of code elements after, terminal is transmitted in up link, described transmission has the time delay that equals protection period GP.
From (or base station receive) code element of base station transmits usually because many access mechanisms and being shared, for example time division multiple access visit (TDMA), frequency division multiple access (FDMA) or CDMA(Code Division Multiple Access) (CDMA) by a plurality of terminals.Therefore, control information must be transmitted to allow each terminal to come multiplexed and coding (for ul transmissions) or detection and its particular data of multichannel decomposition (receiving for down link) by using suitable multiplexed modulation and encoding scheme together with data.Usually, control information (for example, first code element s1 of time slot) in the predetermined and reserved part of time slot is transmitted.Then, each terminal uses this information to detect its particular data in the code element subsequently of time slot.
The transmitting power of supposing all code elements that are used for time slot is a constant, when adding assisted downlink code element provided by the present invention to downlink time slots, described assisted downlink code element can allow to use modulation and encoding scheme, and this is than more efficient in the benchmark time slot.Really, during the benchmark downlink time slots, be the energy that half-duplex terminals spent of arrival away from the base station, be that it needs very big transmitting power, can be used for being used again during the assisted downlink code element of other-end (for example, the half-duplex terminals of close base station) in transmission.As a result, for the assisted downlink code element, nearer terminal can be benefited from the signal to noise ratio of improvement, modulation and encoding scheme more efficiently that this permission is used to transmit, and therefore further increased data rate.Therefore, specific control information must be transferred to terminal so that they are used for new appropriate modulation and encoding scheme multiplexed and detection assisted downlink code element.
According to the present invention, the specific control information relevant with the assisted downlink code element for example is included in this assisted downlink code element by multiplexed control information and data on frequency or coding.As a result, if do not transmit auxiliary symbol, then do not influence the processing of benchmark time slot and do not waste resource.
Under transmission situation based on OFDM, wherein each time slot uses some subcarriers (as shown in Figure 2), control information for example at the reference part of time slot (for example, the first code element s1 at time slot) multiplexed in time during with data, and the control information relevant with each assisted downlink code element quilt in described assisted downlink code element is multiplexed on frequency.
Note, if multiplexed those schemes that are not different from the benchmark structure of time slot that is used for each terminal of modulation and encoding scheme or assisted downlink code element, then available control information can be used and need be in the specific control information in each assisted downlink code element in the benchmark structure of time slot.
Fig. 5 has described the another embodiment of the present invention that relates to up link.
In the illustrated embodiment of Fig. 5, define protection period GP in the mode identical, promptly with postpone RTD (dref) at the round trip of the terminal TEref of reference range dref place relevant with the embodiment of Fig. 4.
In embodiment formerly, apart from the distance of base station BTS is that the terminal TE of d receives the downlink symbol s1-s7 by the downlink reference time slot that base station BTS transmitted, and described reception has 1/2 the delay that equals to postpone corresponding to described round trip apart from d RTD (d).In all downlink symbol that received the downlink reference time slot with after receiving mode switches to transmission mode, it should stand-by period tt on uplink time slot UL, to transmit, described uplink time slot UL is described up link benchmark time slot, because it has q
kIndividual code element (q
kBeing the benchmark number that is used for up link, for example is 7).Time tt be such so that thereby will on base station BTS, be received at time tr by the first uplink symbols ul1 of the up link benchmark time slot of terminal TE transmission, described reception has 1/2 the length of delay that equals to postpone corresponding to described round trip apart from d RTD (d).
Receiving the terminal of benchmark downlink time slots and can be expressed as follows at the time delay period T D (d) between the transmit uplink benchmark time slot on the up link UL:
TD(d)＝tr-te-Dref-RTD(d)＝GP-RTD(d)
According to embodiments of the invention, terminal TE does not have stand-by period TD (d) but the number that is called sul1, sul2 in the transmission diagram 5 is n
UlAuxiliary symbol, number n
UlDepend on that terminal TE separates with base station BTS apart from d.Terminal is only waited for the time delay T (d) that is provided by expression now:
T(d)＝TD(d)-n
ul.ts
ul
Ts wherein
UlIt is the duration of uplink symbols.
More specifically, if be the terminal of d, at n for the distance of distance base station BTS
U1The duration of individual code element adds RTS and n switching time
U1The duration of+1 code element adds and comprises time delay TD (d) between RTS switching time, and then this terminal can be at n
U1Insert the information that is used for the base station in the individual auxiliary uplink symbols.This condition can be written as on the mathematics:
If n
Ul.ts
Ul≤ TD (d)-RTS＜(n
Ul+ 1) ts
Ul, then be inserted into many n
U1Individual auxiliary symbol.
When allowing at n
U1Allow in the individual auxiliary symbol to insert when being used for the information of terminal TE, base station BTS indicates this permission (for example, passing through signaling) so that described terminal TE transmits these n to described terminal TE
U1Individual auxiliary symbol is together with other uplink symbols.
For example, base station BTS is notified the time delay TD (d) that connected each terminal TE must use about it.Then, be the number n that each terminal TE of d can determine auxiliary symbol in the following manner apart from the distance of base station BTS
U1:
n
ul＝integer{(TD(d)-RTS)/ts
ul}
Time delay TD (d1) value that is used for terminal TE1 in Fig. 5 equals the duration ts of a uplink symbols
U1Add RTS switching time.Therefore, terminal TE1 can be in auxiliary uplink symbols at the most (be referred to herein as the code element of sul2, it is before the first uplink symbols ul1 of up link benchmark time slot) with message transmission to described base station BTS.
The duration that time delay TD (d2) value that is used for terminal TE2 in Fig. 5 equals two uplink symbols adds RTS switching time.Therefore, terminal TE2 can be in two auxiliary uplink symbols at the most (uplink symbols sul1 and sul2 before this is the first uplink symbols ul1 at up link benchmark time slot) with message transmission to described base station BTS.
Can on up link transmit two up link auxiliary symbols apart from d less than the terminal TE of d2 apart from base station BTS.Only can and on up link, can not transmit auxiliary symbol greater than the terminal TE of d1 apart from d apart from being included in apart from d1 and apart from the terminal TE between the d2 of base station BTS at up link auxiliary symbol of transmission on the up link apart from base station BTS apart from d.
Fig. 6 has described another embodiment of the present invention, wherein base station BTS can insert down link auxiliary symbol (is a downlink symbol that is called sdl at this) in downlink time slots, whether described down link auxiliary symbol is transferred to the distance that terminal depends on described terminal and base station BTS, and the distance that wherein depends on terminal and base station BTS, terminal TE also can insert auxiliary uplink symbols (is a code element that is called sul at this) in uplink time slot.
More specifically, base station BTS can be in downlink time slots be the number n of the auxiliary symbol that inserts in the terminal at distance d place
D1The number n of the auxiliary symbol that in up link, is inserted with same terminal
U1Must satisfy expression:
n
ul.ts
ul+n
dl.ts
dl＜TD(d)-RTS
As discussed previously, base station BTS can be determined time delay TD (d) for connected each terminal, then with number n
D1With number n
U1Distribute to each terminal.It is for example by this terminal TE of signaling.After all code elements that received the downlink reference time slot, terminal TE receives n
D1Individual follow-up code element.Then, it waits for the time delay T that expression provides:
T(d)＝TD(d)-n
ul.ts
ul-n
dl.ts
dl
Afterwards, it transmits n on up link
U1Individual auxiliary symbol, transmit uplink benchmark time slot then.
When distributing auxiliary symbol in down link and up link, base station BTS must carefully make the uplink symbols transmitted by terminal and can be overlapping by the down link auxiliary symbol that another terminal received.
Claims (34)
1. radio telecommunications system; described radio telecommunications system comprises that at least one is used for the base station that communicates with terminal on bi-directional communication channel; each channel support is divided into the frame of downlink time slots and uplink time slot; each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal; terminal is transmitted other code elements on uplink time slot after having received all code elements that are included in the downlink time slots; after the described downlink time slots is described uplink time slot; described transmission has the time delay that depends on distance between described terminal and the described base station so that so the code element of transmission is received by described base station on such time; the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by; and no matter described distance how; it is characterized in that the base station comprises is used for during protection period at least one assisted downlink code element being transferred to the device that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or being used for during protection period receiving the device of at least one auxiliary uplink symbols of self terminal, described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
2. radio telecommunications system according to claim 1 is characterized in that it comprises
-be used for determining the device of the time delay of connected each terminal;
-be used to allow the base station to incite somebody to action n at the most
D1It is the device of the terminal of d that individual assisted downlink code element is transferred to apart from the distance of base station, and the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-be used to allow described terminal to receive and handle described n
D1The device of individual assisted downlink code element.
3. radio telecommunications system according to claim 1 and 2 is characterized in that it comprises
-be used for determining the device of the time delay of connected each terminal;
-to be used to allow apart from the distance of base station be the terminal transmission n at the most of d
U1The device of individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-be used to allow described base station to receive and handle described n at the most
U1The device of individual auxiliary uplink symbols.
4. radio telecommunications system according to claim 2, the device that it is characterized in that being used for definite distance apart from the base station time delay of the terminal that is d comprise the device that is used for the protection period value is deducted round trip delay RTD (d) value of described terminal.
5. radio telecommunications system according to claim 4; it is characterized in that postponing RTD (dref) value by the round trip that is used for terminal adds that RTS switching time from the receiving mode to the transmission mode provides the protection period value, described terminal is on the predetermined reference range dref of the base station of being considered.
6. radio telecommunications system according to claim 1 and 2 is characterized in that then not comprising information in described at least one assisted downlink code element as long as be not identified for the time delay of terminal.
7. radio telecommunications system according to claim 1 and 2 is characterized in that the time delay that then is used for described terminal is considered to equal protection period as long as be not identified for the time delay of terminal.
8. radio telecommunications system according to claim 1 and 2 is characterized in that described radio telecommunications system comprises the device that is used to notify the time delay that connected each terminal must use about described terminal.
9. radio telecommunications system according to claim 1 and 2, it is characterized in that described base station is used for the modulation of described at least one assisted downlink code element, coding and/or multiplexing scheme, described scheme is different from the employed scheme of code element that the base station is the benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one assisted downlink code element with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
10. radio telecommunications system according to claim 9 is characterized in that the base station is included in the specific control information relevant with described assisted downlink code element in the assisted downlink code element.
11. the base station of radio telecommunications system, described base station is used for communicating on bi-directional communication channel with terminal, each channel support is divided into the frame of downlink time slots and uplink time slot, each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal, it is characterized in that described base station comprises:
-be used for determining the device of the time delay of connected each terminal, described time delay is such so that any terminal is transmitted other code elements on uplink time slot after having received all code elements that are included in the downlink time slots, after the described downlink time slots is described uplink time slot, described transmission has the described time delay that depends on distance between described terminal and the described base station and is received by described base station on such time with the code element that toilet transmits, the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by, and no matter described distance how;
-be used for during protection period, at least one assisted downlink code element being transferred to the device that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or being used for during protection period receiving the device of at least one auxiliary uplink symbols of self terminal, described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
12. base station according to claim 11 is characterized in that described base station BTS comprises that the distance that is used for to the distance base station is the terminal transmission n at the most of d
D1The device of individual assisted downlink code element, the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS.
13., it is characterized in that described base station BTS comprises that being used for from the distance of distance base station is that the terminal of d receives to many n according to claim 11 or 12 described base stations
U1The device of individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS.
14. base station according to claim 12, the device that it is characterized in that being used for definite distance apart from the base station time delay of the terminal that is d comprise the device that is used for the protection period value is deducted round trip delay RTD (d) value of described terminal.
15. base station according to claim 14 is characterized in that postponing RTD (dref) value by the round trip that is used for terminal adds and provide the protection period value switching time that described terminal is on the predetermined reference range dref of the base station that distance is considered.
16., it is characterized in that then described base station does not comprise information at least one assisted downlink code element as long as be not identified for the time delay of terminal according to claim 11 or 12 described base stations.
17., it is characterized in that described base station comprises the device that is used to notify the time delay that connected each terminal must use about described terminal according to the described base station of arbitrary claim among the claim 11-16.
18. according to claim 11 or 12 described base stations, it is characterized in that described base station is used for the modulation of at least one assisted downlink code element, coding and/or multiplexing scheme, described scheme is different from the employed scheme of code element that the base station is the benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one assisted downlink code element with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
19. base station according to claim 18 is characterized in that described base station is included in the specific control information relevant with this assisted downlink code element in the assisted downlink code element.
20. the terminal of radio telecommunications system, described system is a system according to claim 1 and 2, it is characterized in that described terminal comprises the device that is used for receiving and handling at its time timing period described at least one assisted downlink code element.
21. the terminal of radio telecommunications system according to claim 20 is characterized in that described terminal comprises the number n that is used for determining according to the time-delay value that described terminal must be used the assisted downlink code element that described terminal must receive and handle
D1Device.
22. the terminal of radio telecommunications system, described system is a system according to claim 1 and 2, it is characterized in that described terminal comprises the device that is used for transmitting at its time timing period at least one auxiliary uplink symbols.
23. the terminal of radio telecommunications system according to claim 22 is characterized in that described terminal comprises the number n that is used for determining according to the time-delay value that described terminal must be used the auxiliary uplink symbols that described terminal must be transmitted during the described time delay cycle
U1Device.
24., it is characterized in that the time delay that then is used for described terminal is considered to equal protection period as long as be not identified for the time delay of terminal according to the described terminal of arbitrary claim among the claim 20-23.
25. the transmission method in radio telecommunications system, described radio telecommunications system comprises that at least one is used for the base station that communicates with terminal on bi-directional communication channel, each channel support is divided into the frame of downlink time slots and uplink time slot, each downlink time slots comprises a plurality of code elements that are used for being transferred at least one terminal
Said method comprising the steps of:
To be included in code element in the downlink time slots from the base station transmits to the terminal;
Each terminal receives the code element that is included in the described downlink time slots;
Other code elements of each terminal transmission on uplink time slot subsequently, described transmission has the time delay that depends on distance between described terminal and the described base station so that so the code element of transmission is received by described base station on such time, the end that transmits by the base station of described time and the downlink time slots predetermined protection period constant of being separated by, and no matter described distance how;
It is characterized in that described method is included in the protection period base stations during and at least one assisted downlink code element is transferred to the step that can receive the terminal of described at least one assisted downlink code element at its time timing period; and/or described base station receives the step of at least one auxiliary uplink symbols of coming self terminal during protection period, and described terminal can be transmitted described at least one auxiliary uplink symbols at its time timing period.
26. transmission method according to claim 25 is characterized in that described transmission method may further comprise the steps:
The time delay of-definite each terminal that is connected with the base station;
The described base station of-permission is n at the most
D1It is the terminal of d that individual assisted downlink code element is transferred to apart from the distance of base station, and the time delay of described terminal is included in n
D1The duration of individual assisted downlink code element adds the RTS and n switching time from the receiving mode to the transmission mode
D1The duration of+1 assisted downlink code element adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-allow described terminal to receive and handle described n
D1Individual assisted downlink code element.
27., it is characterized in that described transmission method may further comprise the steps according to claim 25 or 26 described transmission methods:
The time delay of-definite each terminal that is connected with the base station;
-to allow apart from the distance of base station be the terminal transmission n at the most of d
U1Individual auxiliary uplink symbols, the time delay of described terminal is included in n
U1The duration of individual auxiliary uplink symbols adds the RTS and n switching time from the receiving mode to the transmission mode
U1The duration of+1 auxiliary uplink symbols adds that switching time from the receiving mode to the transmission mode is between the RTS; And
-allow described base station to receive described n at the most
U1Individual auxiliary uplink symbols.
28. transmission method according to claim 26 is characterized in that the step of the time delay of the terminal that definite distance apart from the base station is d comprises the step that the protection period value is deducted round trip delay RTD (d) value of described terminal.
29. transmission method according to claim 28; it is characterized in that postponing RTD (dref) value by the round trip that is used for terminal adds that RTS switching time from the receiving mode to the transmission mode provides the protection period value, described terminal is on the predetermined reference range dref of the base station of being considered.
30., it is characterized in that then the base station does not comprise information at least one assisted downlink code element as long as be not identified for the time delay of terminal according to claim 25 or 26 described transmission methods.
31., it is characterized in that described transmission method comprises the step that is used to notify the time delay that connected each terminal must use about described terminal according to claim 25 or 26 described transmission methods.
32. transmission method according to claim 31 is characterized in that the time delay that then is used for described terminal is considered to equal protection period as long as be not identified for the time delay of terminal.
33. according to claim 25 or 26 described transmission methods, it is characterized in that described transmission method comprises the step of the modulation, coding and/or the multiplexing scheme that are used at least one assisted downlink code element, described scheme is different from and is the employed scheme of the code element of benchmark time slot, described base station is transferred to some terminals with specific control information and decomposes described at least one auxiliary symbol with detection, decoding and multichannel, and described these terminals can receive described at least one the assisted downlink code element that is used for these terminals.
34. transmission method according to claim 33 is characterized in that comprising the specific control information relevant with this assisted downlink code element in the assisted downlink code element.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05291571.7 | 2005-07-21 | ||
| EP05291571 | 2005-07-21 | ||
| EP05291972.7 | 2005-09-22 | ||
| EP05291972A EP1746743B1 (en) | 2005-07-21 | 2005-09-22 | Method for transmission in a TDD system with variable length guard period |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1909691A CN1909691A (en) | 2007-02-07 |
| CN1909691B true CN1909691B (en) | 2010-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101061864A Active CN1909691B (en) | 2005-07-21 | 2006-07-20 | Wireless telecommunication system including at least a base station intended to communicate with terminals |
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| Country | Link |
|---|---|
| CN (1) | CN1909691B (en) |
| AT (1) | ATE454756T1 (en) |
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| ES (1) | ES2339948T3 (en) |
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| US8780790B2 (en) * | 2008-01-07 | 2014-07-15 | Qualcomm Incorporated | TDD operation in wireless communication systems |
| WO2009097806A1 (en) * | 2008-02-04 | 2009-08-13 | Zte Corporation | Frame structure and transmission method in a time division duplex wireless communication system |
| CN102811191B (en) | 2011-05-31 | 2016-06-08 | 华为技术有限公司 | A kind of data transmission method and device |
| CN109348510B (en) * | 2018-10-17 | 2021-11-19 | 中国联合网络通信集团有限公司 | Load balancing method, device and base station |
| CN116996952A (en) * | 2018-11-19 | 2023-11-03 | 华为技术有限公司 | Uplink switching method, communication device and communication system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393078A (en) * | 2000-09-29 | 2003-01-22 | 松下电器产业株式会社 | Data communication device and data commuunication method |
| US6810023B1 (en) * | 1998-02-27 | 2004-10-26 | Siemens Aktiengesellschaft | Method and radio communications system for transmitting information between a base station and other radio stations |
| CN1592147A (en) * | 2003-08-27 | 2005-03-09 | 西门子公司 | Method for transmitting signal in wireless communication system |
-
2005
- 2005-09-22 AT AT05291972T patent/ATE454756T1/en not_active IP Right Cessation
- 2005-09-22 DE DE602005018765T patent/DE602005018765D1/en active Active
- 2005-09-22 ES ES05291972T patent/ES2339948T3/en active Active
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6810023B1 (en) * | 1998-02-27 | 2004-10-26 | Siemens Aktiengesellschaft | Method and radio communications system for transmitting information between a base station and other radio stations |
| CN1393078A (en) * | 2000-09-29 | 2003-01-22 | 松下电器产业株式会社 | Data communication device and data commuunication method |
| CN1592147A (en) * | 2003-08-27 | 2005-03-09 | 西门子公司 | Method for transmitting signal in wireless communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602005018765D1 (en) | 2010-02-25 |
| CN1909691A (en) | 2007-02-07 |
| ATE454756T1 (en) | 2010-01-15 |
| ES2339948T3 (en) | 2010-05-27 |
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