CN101389120A - Method and device for transmitting ACK/NACK signal - Google Patents

Method and device for transmitting ACK/NACK signal Download PDF

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Publication number
CN101389120A
CN101389120A CN 200710121649 CN200710121649A CN101389120A CN 101389120 A CN101389120 A CN 101389120A CN 200710121649 CN200710121649 CN 200710121649 CN 200710121649 A CN200710121649 A CN 200710121649A CN 101389120 A CN101389120 A CN 101389120A
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nack signal
ack
time slot
frequency resource
resource
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CN101389120B (en
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蒋海林
房家奕
鲍炜
毕海洲
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses a method for ACK/NACK transmission, comprising determining frequency resource used for ACK/NACK signal transmission in the pilot timeslot; notifying configuration information of resource used for ACK/NACK signal transmission to user equipments UE in the cell; transmitting ACK/NACK signal on frequency resource determined in the pilot timeslot. Comparing with technique in prior art, transmitting ACK/NACK signal in pilot timeslot not only enhances utilization of frequency resource of pilot timeslot, but also increases use of the pilot timeslot, having no influence to data transmission rate of conventional timeslots. Furthermore, the method for transmitting ACK/NACK signal in pilot timeslot can be combined with the ACK/NACK signal transmission method in prior art, so as to reach a better embodiment effect. The invention further discloses an apparatus for ACK/NACK signal transmission.

Description

The method and apparatus of transferring ACK/NACK signal
Technical field
The present invention relates to the Long Term Evolution of TDD (time division duplex) system, relate in particular to the method and apparatus of a kind of transferring ACK/NACK signal.
Background technology
At present, 3GPP (third generation partner program) tissue has set about beginning its existing system standard is carried out long-term evolution.In the middle of numerous physical layer transmission technology, OFDM (OFDM) technology is with its higher availability of frequency spectrum, and lower processing complexity becomes the first-selection in all descending schemes.
Be a kind of multi-carrier modulation communication technology on the OFDM technological essence, its basic principle is the data flow of a two-forty to be decomposed into several rate data streams transmit simultaneously on one group of mutually orthogonal subcarrier.The OFDM technology is because its multicarrier character has performance advantage aspect a lot.
A significant advantage of OFDM technology is exactly data parallel transmissions on a plurality of subcarriers respectively, and the length of the symbol on each subcarrier increases accordingly, and is insensitive to channel delay; Add protection on each symbol at interval by further giving, promptly introduce CP (Cyclic Prefix) under the situation of channel delay, can eliminate ISI (intersymbol interference) fully less than circulating prefix-length.Like this, each subcarrier has all experienced flat fading channel.In addition, the OFDM technology also has advantages such as the ability of availability of frequency spectrum height, anti-narrow band interference and frequency selective fading is stronger.
In the evolution scheme of TDD system, the transmission of data division can be adopted the OFDM mode.Subframe structure in the TDD system evolved scheme as shown in Figure 1, the time span of a subframe is 5ms (millisecond), be divided into 7 common time slots (TS0~TS6) and three special time slots (and DwPTS, GP, UpPTS).
UpPTS (uplink pilot time slot) only is used for UE (subscriber equipment) and sends the UpPCH signal at random access procedure, and DwPTS (descending pilot frequency time slot) only is used for network side and sends P-SCH (primary synchronization channel) signal.
Because in the evolution scheme of TDD system, UpPTS is not used in the transmission data, and its unique purposes is that UE sends the UpPCH signal in random access procedure, and the shared resource of UpPCH signal seldom, causes the resource utilization of UpPTS very low.In like manner, DwPTS also is not used in the transmission data, and its unique purposes is that network side sends the P-SCH signal that is used for down-going synchronous, and the P-SCH signal only takies the fixedly bandwidth of 1.25MHz, and to the system of bandwidth greater than 1.25MHz, remaining running time-frequency resource is wasted.
Summary of the invention
In view of this, technical problem to be solved by this invention provides the method for a kind of transferring ACK/NACK signal, to improve the resource utilization of UpPTS and DwPTS.
Another technical problem that the present invention solves provides the device of a kind of transferring ACK/NACK signal.
For this reason, technical scheme provided by the invention is as follows:
The method of a kind of transferring ACK/NACK signal comprises:
Determine in pilot time slot, to be used for the frequency resource of transferring ACK/NACK signal;
To comprise the user equipment (UE) in the configuration information of resource notifying cell that is used for transferring ACK/NACK signal;
On the frequency resource of determining described in the pilot time slot, transmit ack/nack signal.
Preferably, determine the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource.
Preferably, by pre-configured frequency resource selection strategy, determine the frequency resource of transferring ACK in pilot time slot/NACK signal.
Preferably, the mode of transferring ACK/NACK signal is a coherent manner, or incoherent mode.
Wherein, described pilot time slot is DwPTS, and described ack/nack signal is descending ack/nack signal.
Wherein, described pilot time slot is UpPTS, and described ack/nack signal is uplink ACK/NACK signal.
Preferably, when adopting coherent manner transmission uplink ACK/NACK signal, frequency pilot sign and ack/nack signal time division multiplexing, or frequency division multiplexing.
The device of a kind of transferring ACK/NACK signal comprises:
The resource determining unit is used for determining being used to send at pilot time slot the frequency resource of ack/nack signal;
Notification unit is used for the user equipment (UE) that will comprise in the configuration information of resource notifying cell that is used for transferring ACK/NACK signal;
Transmission unit is used for transmitting ack/nack signal on the frequency resource of determining described in the pilot time slot.
Preferably, the resource determining unit is determined the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource.
Preferably, the resource determining unit is determined the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource selection strategy.
Wherein, described pilot time slot is DwPTS, and described ack/nack signal is descending ack/nack signal.
Wherein, described pilot time slot is UpPTS, and described ack/nack signal is uplink ACK/NACK signal.
As can be seen, in terms of existing technologies,, not only can improve the frequency resource utilance of pilot time slot, also increase the purposes of pilot time slot at pilot time slot transferring ACK/NACK signal, and to the message transmission rate of conventional time slot also without any influence.In addition, can also will be used, thereby reach the better implement effect in the method for pilot time slot transferring ACK/NACK signal and the method for existing transferring ACK/NACK signal.
Description of drawings
Fig. 1 is the subframe structure schematic diagram in the TDD system evolved scheme;
Fig. 2 is the schematic diagram that sends the UpPCH signal in the Long Term Evolution scheme in UpPTS;
Fig. 3 is the flow chart at UpPTS transmission uplink ACK/NACK signal provided by the invention;
Fig. 4-1,4-2 are respectively the schematic diagrames that frequency pilot sign and uplink ACK/NACK signal time division multiplexing, frequency division multiplexing transmit;
Fig. 5 is the schematic diagram that sends P-SCH in the Long Term Evolution scheme in DwPTS;
Fig. 6 is the method flow diagram at DwPTS transferring ACK/NACK signal provided by the invention;
Fig. 7-1,7-2 adopt coherent manner, incoherent mode to transmit the schematic diagram of descending ack/nack signal at DwPTS;
Fig. 8 is the schematic representation of apparatus of transferring ACK provided by the invention/NACK signal.
Embodiment
Fig. 2 is the schematic diagram that sends the UpPCH signal in the Long Term Evolution scheme in UpPTS, and the dash area among the figure represents to be used to send the frequency resource of UpPCH signal.As can be seen, if UpPTS only is used to send the UpPCH signal, will there be a large amount of frequency resources to be wasted in vain.
Below, 1 pair of method at UpPTS transmission uplink ACK/NACK signal provided by the invention is further described in detail in conjunction with the embodiments, and Fig. 3 shows the flow process at UpPTS transmission uplink ACK/NACK signal.
In step 31, determine in UpPTS, to be used to transmit the frequency resource of uplink ACK/NACK signal.
Because it is limited being used to transmit the frequency resource of UpPCH in UpPTS, therefore, will there be a large amount of residual frequency resources to be available for transmitting uplink ACK/NACK signal when system bandwidth greatly the time.Concrete which residual frequency resource transmission uplink ACK/NACK signal that adopts, mode has multiple.
A kind of mode can be: the pre-configured residual frequency resource that is used to transmit uplink ACK/NACK signal, adopt the residual frequency resource of described configuration to be used to transmit uplink ACK/NACK signal regularly and get final product.Adopt the benefit of this mode to be, realize simply the processing complexity when having reduced actual motion.
Another kind of mode is: pre-configured frequency resource selection strategy, dynamically select to be used to transmit the residual frequency resource of uplink ACK/NACK signal according to described frequency resource selection strategy.Adopt the benefit of this mode to be, when actual motion, can select to be used to transmit the residual frequency resource of descending ack/nack signal more neatly according to the operating position of frequency resource.
In step 32, will comprise the interior UE of configuration information of resource notifying cell that is used to transmit uplink ACK/NACK signal.
Resource described here had both comprised time interval resource, and promptly UpPTS also comprises the frequency resource of determining in the step 31.
Can give all UE in the sub-district with described configuration information broadcast announcement by system message, for example configuration information is broadcast to all UE in the sub-district by D-BCCH.Also can notify each UE respectively with described configuration information by the scheduling controlling channel.
In step 33, on the frequency resource of determining described in the UpPTS, receive uplink ACK/NACK signal.
After UE receives described resource allocation information, can learn transmission uplink ACK/employed time interval resource of NACK signal and frequency resource.
UE is normal to receive descending control data or business datum, and utilizes the correspondent frequency resource to send uplink ACK/NACK signal at UpPTS.
Need to prove, described configuration information not only includes only time interval resource and the frequency resource information that is used to transmit uplink ACK/NACK signal, also should comprise mode, the transmission sign indicating number sequence that uplink ACK/the NACK signal is adopted and the corresponding relation of uplink ACK/NACK signal and descending scheduling control channel of transmission uplink ACK/NACK signal.
Wherein, the mode of transmission uplink ACK/NACK signal comprises coherent manner and incoherent mode.If adopt coherent manner transmission uplink ACK/NACK signal, promptly in transmission signals, comprise frequency pilot sign, then when detecting uplink ACK/NACK signal, demodulation pilot frequency symbol at first, carry out channel estimating according to frequency pilot sign again and obtain the up channel parameter, receive ack/nack signal according to this channel parameter then.If adopt incoherent mode to transmit uplink ACK/NACK signal, promptly do not comprise frequency pilot sign in Chuan Shu the signal, then direct demodulation upward signal detects ack/nack signal.When adopting coherent manner transmission uplink ACK/NACK signal, frequency pilot sign and ack/nack signal both can time division multiplexinges, also can frequency division multiplexing.
Fig. 4-the 1st, the schematic diagram of frequency pilot sign and uplink ACK/NACK signal time division multiplexing transmission; Fig. 4-the 2nd, the schematic diagram of frequency pilot sign and uplink ACK/NACK signal frequency division multiplexing transmission.
In Fig. 4-1, frequency pilot sign adopts short sign format, and the OFDM symbol of this frequency pilot sign and transmission uplink ACK/NACK signal carries out multiplexing in time domain, all use all frequency resources of determining in the step 31 to transmit.
In Fig. 4-2, dash area is represented frequency pilot sign, and frequency pilot sign is placed on the non-conterminous subcarrier of two OFDM symbol frequency domains.Be that it is that remaining subcarrier then is used to transmit uplink ACK/NACK signal on 6 the OFDM subcarrier that the frequency pilot sign among Fig. 4-2 is placed on frequency domain interval with different among Fig. 4-1.
Because ack/nack signal only need transmit 1bit or 2bits information, therefore can adopt the mode of yard sequence to transmit, as ZC sequence commonly used, the different UEs in the same sub-district can be distinguished by the different phase shifts of ZC sequence.
When adopting incoherent mode to transmit uplink ACK/NACK signal, also can adopt similar with random access leader sequence signal structure.
As can be seen, in terms of existing technologies,, not only can improve the frequency resource utilance of UpPTS, also increase the purposes of UpPTS at UpPTS transmission uplink ACK/NACK signal, and to the message transmission rate of conventional time slot also without any influence.In addition, can also be used transmit the method for uplink ACK/NACK signal and the method for existing transmission uplink ACK/NACK signal at UpPTS, thereby reach the better implement effect.
By embodiment 1, after the method at UpPTS transmission uplink ACK/NACK signal described,, the method for transmitting descending ack/nack signal at DwPTS is further described in detail below in conjunction with embodiment 2.
At present, in the Long Term Evolution scheme descending ack/nack signal is not also had clear and definite regulation, the common recognition of tentatively reaching comprises:
1, when resource allocation confirmation signal implicit expression is carried ack/nack signal, just no longer needs explicit ACK/NACK channel;
2,1~3 OFDM symbol of ACK/NACK channel occupancy, the TDD mode may be with the difference of up-downgoing ratio, and the OFDM symbolic number that the ACK/NACK channel needs can increase.
Fig. 5 shows in the Long Term Evolution scheme, only utilizes limited subcarrier of frequency band central authorities to send P-SCH in DwPTS, and dash area represents to be used to send the subcarrier of P-SCH among the figure.Wherein, described limited subcarrier can be called special frequency resource.When system bandwidth is big, a large amount of residual frequency resources except that special frequency resource will be arranged.Can find out through above-mentioned analysis, can utilize the descending ack/nack signal of residual frequency resource transmission among the DwPTS.
For making those skilled in the art can understand the present invention better, specify below in conjunction with 2 couples of the embodiment method of transmitting descending ack/nack signal at DwPTS provided by the invention, Fig. 6 shows the flow process of this method.
In step 61, determine in DwPTS, to be used to transmit the frequency resource of descending ack/nack signal.
Because it is limited being used to transmit the special frequency resource of P-SCH in DwPTS, therefore, will there be a large amount of residual frequency resources to be available for transmitting descending ack/nack signal when system bandwidth greatly the time.The concrete descending ack/nack signal of which residual frequency resource transmission that adopts, mode has multiple.
A kind of mode can be: the residual frequency resource of descending ack/nack signal is transmitted in pre-configured fixing being used to.Another kind of mode is: according to the frequency resource selection strategy of configuration, dynamically select to be used to transmit the residual frequency resource of descending ack/nack signal.
In step 62, will comprise the interior UE of configuration information of resource notifying cell that is used to transmit descending ack/nack signal.
Resource described here had both comprised time interval resource, and promptly DwPTS also comprises the frequency resource of determining in the step 61.
Can give all UE in the sub-district with described configuration information broadcast announcement by system message, for example configuration information is broadcast to all UE in the sub-district by D-BCCH.Also can notify each UE respectively with described configuration information by the scheduling controlling channel.
When needs send descending ack/nack signal, in step 63, send descending ack/nack signal in the frequency resource of determining described in the DwPTS.
After UE receives the described resource allocation information of base station transmission, can learn transmission employed time interval resource of descending ack/nack signal and frequency resource.
UE is normal to send up control data or business datum, and waits for the descending ack/nack signal of reception in the corresponding frequencies resource of DwPTS.
Need to prove, described configuration information not only includes only time slot, the frequency resource information that is used to transmit descending ack/nack signal, also should comprise the mode, the transmission sign indicating number sequence that descending ack/nack signal adopted and the corresponding relation of descending ack/nack signal and uplink scheduling control channel that transmit descending ack/nack signal.
Wherein, the mode of transmitting descending ack/nack signal comprises coherent manner and incoherent mode.If adopt coherent manner to transmit descending ack/nack signal, promptly in transmission signals, comprise frequency pilot sign, then UE can estimate channel according to frequency pilot sign, and then detects descending ack/nack signal.If adopt incoherent mode to transmit descending ack/nack signal, promptly do not comprise frequency pilot sign in Chuan Shu the signal, then UE can directly carry out the incoherent signal detection, detects descending ack/nack signal.
Fig. 7-1,7-2 show respectively at DwPTS and adopt coherent manner, incoherent mode to transmit the schematic diagram of descending ack/nack signal.
Transmit sign indicating number sequence that descending ack/nack signal adopts and can be ZC (Zadoff-Chu) sequence or other auto-correlation, the good sequence of cross-correlation performance.
As can be seen, in terms of existing technologies, transmit descending ack/nack signal, not only can improve the frequency resource utilance of DwPTS, also increased the purposes of DwPTS at DwPTS, and to the message transmission rate of conventional time slot also without any influence.In addition, can also be used transmit the method for descending ack/nack signal and the method for the descending ack/nack signal of existing transmission at DwPTS, thereby reach the better implement effect.
Based on method at pilot time slot transferring ACK/NACK signal, the invention allows for accordingly at the device of pilot time slot transferring ACK/NACK signal, Fig. 8 is this schematic representation of apparatus.
The device of transferring ACK/NACK signal comprises: resource determining unit S81, notification unit S82 and transmission unit S83.
When utilizing UpPTS transmission uplink ACK/NACK signal, utilize resource determining unit S81 can determine to be used to send the frequency resource of uplink ACK/NACK signal at UpPTS;
When utilizing DwPTS to transmit descending ack/nack signal, utilize resource determining unit S81 can determine to be used to send the frequency resource of descending ack/nack signal at DwPTS.
No matter resource determining unit S81 determines to send the frequency resource of uplink ACK/NACK signal, still determines to send the frequency resource of descending ack/nack signal, and its mode all has a variety of.
A kind of mode can be: the pre-configured residual frequency resource that is used to transmit uplink ACK/NACK or descending ack/nack signal, adopt the residual frequency resource of described configuration to be used to transmit the upstream or downstream ack/nack signal regularly and get final product.Adopt the benefit of this mode to be, realize simply the processing complexity when having reduced actual motion.
Another kind of mode is: pre-configured frequency resource selection strategy, dynamically select to be used to transmit the residual frequency resource of uplink ACK/NACK or descending ack/nack signal according to described frequency resource selection strategy.Adopt the benefit of this mode to be, when actual motion, can select to be used to transmit the residual frequency resource of descending ack/nack signal more neatly according to the operating position of frequency resource.
After resource determining unit S81 determines to be used to send the frequency resource of ack/nack signal in pilot time slot, notification unit S82 will comprise the UE in the configuration information of resource notifying cell that is used for transferring ACK/NACK signal.
Resource described here had both comprised time interval resource, and promptly pilot time slot also comprises the determined frequency resource of resource determining unit S81.
Notification unit S82 can give all UE in the sub-district with described configuration information broadcast announcement by system message, for example by D-BCCH configuration information is broadcast to all UE in the sub-district, also can notify each UE respectively with described configuration information by the scheduling controlling channel.
When utilizing UpPTS transmission uplink ACK/NACK signal, transmission unit S83 will receive uplink ACK/NACK signal that UE sends on the frequency resource of determining described in the UpPTS;
When utilizing DwPTS to transmit descending ack/nack signal, transmission unit S83 will send descending ack/nack signal to UE on the frequency resource of determining described in the DwPTS.
Need to prove, described configuration information not only includes only time interval resource and the frequency resource information that is used to transmit uplink ACK/NACK signal, also should comprise mode, the transmission sign indicating number sequence that uplink ACK/the NACK signal is adopted and the corresponding relation of uplink ACK/NACK signal and descending scheduling control channel of transmission uplink ACK/NACK signal.
Wherein, the mode of transmission uplink ACK/NACK signal comprises coherent manner and incoherent mode.When adopting coherent manner transmission uplink ACK/NACK signal, frequency pilot sign and ack/nack signal both can time division multiplexinges, also can frequency division multiplexing.
Because ack/nack signal only need transmit 1bit or 2bits information, therefore can adopt the mode of yard sequence to transmit, as ZC sequence commonly used, the different UEs in the same sub-district can be distinguished by the different phase shifts of ZC sequence.
When adopting incoherent mode to transmit uplink ACK/NACK signal, also can adopt similar with random access leader sequence signal structure.
According to described disclosed embodiment, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (13)

1, the method for a kind of transferring ACK/NACK signal is characterized in that, comprising:
Determine in pilot time slot, to be used for the frequency resource of transferring ACK/NACK signal;
To comprise the user equipment (UE) in the configuration information of resource notifying cell that is used for transferring ACK/NACK signal;
On the frequency resource of determining described in the pilot time slot, transmit ack/nack signal.
2, the method for claim 1 is characterized in that, determines the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource.
3, the method for claim 1 is characterized in that, by pre-configured frequency resource selection strategy, determines the frequency resource of transferring ACK in pilot time slot/NACK signal.
4, the method for claim 1 is characterized in that, the mode of transferring ACK/NACK signal is a coherent manner, or incoherent mode.
5, as any described method of claim 1 to 4, it is characterized in that described pilot time slot is a descending pilot frequency time slot, described ack/nack signal is descending ack/nack signal.
6, as any described method of claim 1 to 3, it is characterized in that described pilot time slot is a uplink pilot time slot, described ack/nack signal is uplink ACK/NACK signal.
7, method as claimed in claim 4 is characterized in that, described pilot time slot is a uplink pilot time slot, and described ack/nack signal is uplink ACK/NACK signal.
8, method as claimed in claim 7 is characterized in that, when adopting coherent manner transmission uplink ACK/NACK signal, and frequency pilot sign and ack/nack signal time division multiplexing, or frequency division multiplexing.
9, the device of a kind of transferring ACK/NACK signal is characterized in that, comprising:
The resource determining unit is used for determining being used to send at pilot time slot the frequency resource of ack/nack signal;
Notification unit is used for the user equipment (UE) that will comprise in the configuration information of resource notifying cell that is used for transferring ACK/NACK signal;
Transmission unit is used for transmitting ack/nack signal on the frequency resource of determining described in the pilot time slot.
10, device as claimed in claim 9 is characterized in that, the resource determining unit is determined the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource.
11, device as claimed in claim 9 is characterized in that, the resource determining unit is determined the frequency resource of transferring ACK in pilot time slot/NACK signal by pre-configured frequency resource selection strategy.
12, as any described device of claim 9 to 11, it is characterized in that described pilot time slot is a descending pilot frequency time slot, described ack/nack signal is descending ack/nack signal.
13, as any described device of claim 9 to 11, it is characterized in that described pilot time slot is a uplink pilot time slot, described ack/nack signal is uplink ACK/NACK signal.
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