Background technology
3-G (Generation Three mobile communication system) (3G) adopts the CDMA multi-access mode, supports multimedia service, has higher competitiveness.In order to ensure keep this competitiveness in the longer time, 3GPP has started Long Term Evolution (Long Term Evolution, the LTE) research project of 3G wireless interface technology.
At present, the LTE system determines to support 2 kinds of frame structures.First kind frame structure is supported Frequency Division Duplexing (FDD) (FDD) and two kinds of duplex modes of time division duplex (TDD) as shown in Figure 1.Wherein, the frame length of a radio frames is 10ms, comprises 20 time slots altogether, and time slot mark from 0 to 19, every slot length are 0.5ms, and two continuous time slot are defined as a subframe, and subframe i is made up of time slot 2i and 2i+1, i=0 wherein, and 1 ..., 9.
The second class frame structure is only supported the TDD duplex mode as shown in Figure 2.Wherein, the frame length of a radio frames is 10ms, comprises the field of two 5ms.Each field (is labeled as TS0~TS6) and 3 special time slots (special descending time slot (GwPTS), protection is (GP) time slot and special ascending time slot (UpPTS) at interval) are formed by 7 general service time slots.Every subframe definition is a business time-slot.Wherein,subframe 0 and special descending time slot always are used for downlink transfer, and special ascending time slot andsubframe 1 always are used for uplink.
The basic structure of the uplink of determining in the LTE system is for as shown in Figure 3.Each uplink service subframe can be carried Uplink Shared Channel (PUSCH) and ascending control channel (PUCCH).Wherein, the upstream control signaling that PUSCH is used for service data transmission and follows, PUCCH is used to transmit independent upstream control signaling.
For a subscriber equipment (UE, user equipment), if there is uplink business data, the base station sends ascending scheduling control signaling to subscriber equipment, be this user equipment allocation ascending resource, as PUSCH, the upstream control signaling of this subscriber equipment and data Time Division Multiplexing transmit at PUSCH together; If there is not uplink business data, the upstream control signaling of subscriber equipment then transmits on the PUCCH that distributes for this user in advance.The PUCCH channel Mapping is to the reservation frequency band of the both sides of system bandwidth, and the mode by frequency hopping realizes.
In uplink basic structure shown in Figure 3, the upstream control signaling that transmits among the 1 expression PUSCH, the business datum of transmitting among the 2 expression PUSCH, 1 and 2 adopt time-multiplexed mode to share the whole service subframe; The a pair of frequency-hopping resource in the frequency band is reserved in 3 and 4 expression system bandwidth both sides, is used to carry a PUCCH.
As seen by above-mentioned, in the uplink basic structure that the LTE system determines, the uplink control signaling transmission can have dual mode, and when there was uplink business data in subscriber equipment, upstream control signaling followed uplink business data to transmit at PUSCH; When there was not uplink business data in subscriber equipment, upstream control signaling transmitted at PUCCH separately.
The LTE system is based on the OFDM technology, and its subcarrier spacing is set at 15kHz, and corresponding OFDM symbol lengths is 66.67us.For first kind frame structure, its each slot length 0.5ms when supporting that unicast service and little covering are used, uses the short CP of length as 4.76us, and every time slot is made of 7 OFDM symbols; When supporting that many cell broadcaste services and big covering are used, use the long CP of length as 16.66us, this moment, each time slot was made of 6 OFDM symbols.
For the second class frame structure, its subcarrier spacing and OFDM symbol lengths remain unchanged, but the length setting of each subframe is 0.675ms.Similar with first kind frame structure, the configuration that the second class frame structure has defined two kinds of CP length equally is used to support different application scenarioss: when unicast service and little covering application, use length to be about the short CP of 8.33us, each subframe is made of 9 OFDM symbols; Many cell broadcaste services and big the covering under the application, use length to be about the long CP of 17.71us, each subframe is made of 8 OFDM symbols.
As seen by above-mentioned, two kinds of frame structures of LTE system support have than big-difference, and this brings very big difficulty for the realization of dual mode system.And, the not equal difference that also causes on the two performance of the difference of subframe lengths and CP length.These all are unfavorable for the popularization and research and development progress of LTE system.Therefore, the LTE decision for a kind of, is carried out the optimization of structure with two kinds of tdd frame structures unifications, and the consistency of raising and FDD system promotes performance.
The applicant is the 200710176799.X (applying date a:step 501 2007.11.2) at application number, set in advance PUCCH only in common uplink service time slot carrying, reverse link traffic channel is in common uplink service time slot and special ascending time slot UpPTS carrying, and UpPTS does not carry PUCCH.
In LTE tdd frame structure shown in Figure 4, be to describe in detail in the application for a patent for invention of 200710176799.X about the application number that is configured in the applicant of special area.Particularly, the concrete duration of 3 special time slots can flexible configuration in the special area, to guarantee with the compatibility of TD-SCDMA system and to adopt different GP length to satisfy different covering requirements.In this case, along with the different uplink and downlink timeslot ratios of the TD-SCDMA system of compatibility, and the difference of system covers requirement, and UpPTS has different length, takies different symbol (DFT-SOFDM symbol) number.For example, when adopting weak point CP, according to the different uplink and downlink timeslot ratios of TD-SCDMA system and the covering requirement of system, UpPTS is minimum may to have only 2 symbol lengths, has 11 symbol lengths at most.
Because UpPTS also belongs to sub-frame of uplink, so the uplink process also should be taken UpPTS into account.But difference along with system's uplink and downlink timeslot ratio, the length of UpPTS is constantly to change in the LTE tdd frame structure shown in Figure 4, therefore in LTE tdd frame shown in Figure 4, can't directly utilize the basic structure of uplink in the LTE system shown in Figure 3 to carry out the uplink control signaling transmission, be difficult to provide unified design, can only design separately at every kind of UpPTS length at all situations.Cause multiple implementation, such complexity is difficult to accept.
Summary of the invention
In view of this, the invention provides a kind of tdd systems and ascending control signaling transmission method, can under different uplink and downlink timeslot ratios, simplify the design of ascending control channel, guarantee the uplink control signaling normal transmission.
For achieving the above object, the present invention adopts following technical scheme:
A kind of ascending control signaling transmission method of tdd systems comprises:
Set in advance ascending control channel PUCCH only in common uplink service time slot carrying, reverse link traffic channel is in common uplink service time slot and special ascending time slot UpPTS carrying, and UpPTS does not carry PUCCH;
When any subscriber equipment need transmit upstream control signaling, the uplink control signaling channel was selected to be used to transmit according to whether there being common uplink service time slot in the current system in the base station, and this subscriber equipment is at corresponding channel upstream control signaling.
Preferably, described base station according to whether there being common uplink service time slot in the system being selected to be used to transmit the uplink control signaling channel and is comprised:
If do not have common uplink service time slot in the system, the base station is this user equipment allocation PUSCH on UpPTS, is used to transmit upstream control signaling.
Preferably, described base station comprises for user equipment allocation PUSCH on UpPTS:
When not having upstream data, the base station comprises the dispatch of upstream control signaling feedback channel in sending to the descending scheduling signaling of subscriber equipment, is used for dispatching UpPTS carrying uplink control signaling ascending resource.
Preferably, described subscriber equipment comprises at corresponding channel upstream control signaling:
Subscriber equipment receives the descending scheduling signaling, extract comprising the dispatch of described upstream control signaling feedback channel, be defined as the PUSCH of this user equipment allocation, and with upstream control signaling transmission separately on this PUSCH.
Preferably, described base station comprises for user equipment allocation PUSCH on UpPTS:
When not having upstream data, the base station sends the new ascending scheduling control signaling that sets in advance to subscriber equipment, is used for dispatching UpPTS carrying uplink control signaling ascending resource.
Preferably, described subscriber equipment comprises at corresponding channel upstream control signaling:
Subscriber equipment receives the signaling that the base station sends, when determining that this signaling is the new ascending scheduling control signaling that sets in advance, be defined as the carrying uplink control signaling PUSCH of this user equipment allocation according to the ascending resource of dispatching in this signaling, with upstream control signaling transmission separately on described PUSCH.
Preferably, described base station comprises for user equipment allocation PUSCH on UpPTS:
When not having upstream data, the base station sends ascending scheduling control signaling to subscriber equipment, is used for dispatching UpPTS carrying uplink control signaling ascending resource.
Preferably, described subscriber equipment comprises at corresponding channel upstream control signaling:
Subscriber equipment receives the uplink scheduling signaling, according to the ascending resource of dispatching in this signaling, is defined as the PUSCH of this user equipment allocation, when not having upstream data, upstream control signaling and virtual data is followed on PUSCH transmit.
Preferably, the base station according to whether there being common uplink service time slot in the system being selected to be used to transmit the uplink control signaling channel and is comprised:
If have common uplink service time slot in the system, the base station further according to whether having upstream data, selects PUCCH or PUSCH to be used to transmit upstream control signaling.
Preferably, described base station further according to whether having upstream data, is selected PUCCH or PUSCH to be used to transmit upstream control signaling and is comprised:
If there is upstream data, base station selected PUSCH is used to transmit upstream control signaling, and does not distribute at this subscriber equipment under the situation of PUSCH, for this user distributes PUSCH carrying upstream control signaling;
If there is not upstream data, the PUCCH transmission upstream control signaling in the base station selected common ascending time slot.
As seen from the above technical solution, among the present invention, set in advance PUCCH only in common uplink service time slot carrying, PUSCH is in common uplink service time slot and UpPTS carrying, and UpPTS does not carry PUCCH.Among the present invention, common uplink service time slot is meant the uplink service of other except that UpPTS time slot in the radio half frame.When needs carried out the uplink control signaling transmission, the uplink control signaling channel was selected to be used to transmit according to whether there being common uplink service time slot in the current system in the base station, and this subscriber equipment is at corresponding channel upstream control signaling.By the way, the uplink and downlink timeslot ratio of system no matter, on UpPTS, all do not carry PUCCH, make the designs simplification of ascending control channel, do not need different ascending control channel structures to be set respectively, when utilizing UpPTS to carry out the upstream control signaling transmission according to different UpPTS length, all adopt the form transmission upstream control signaling of following upstream data, to guarantee the uplink control signaling normal transmission.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: PUCCH is set only in common uplink service time slot carrying, UpPTS does not carry PUCCH, and carrying PUSCH simplifies the ascending control channel form.
Particularly, do not carry PUCCH, can carry PUSCH at the UpPTS time slot.Like this, when having common uplink service time slot, just uplink and downlink timeslot ratio is 1: 3,2: 2 or 3: 1 o'clock, if there is upstream data, then upstream control signaling follows upstream data to transmit on the PUSCH of ascending time slot arbitrarily; If there is no upstream data then transmits on the PUCCH of upstream control signaling in common uplink service time slot.When UpPTS was unique ascending time slot, just uplink and downlink timeslot ratio was 0: 4 o'clock, and similar with other time slot ratios if there is upstream data, upstream control signaling follows upstream data to transmit on PUSCH; If there is no upstream data be ascending time slot owing to have only the UpPTS time slot, and UpPTS does not carry PUCCH, at this moment, although there is not upstream data, still is user equipment allocation PUSCH, thereby upstream control signaling is transmitted on the PUSCH that distributes.
Fig. 5 is the overview flow chart of the ascending control signaling transmission method of tdd systems among the present invention.As shown in Figure 5, this method comprises:
Step 501 sets in advance PUCCH only in common uplink service time slot carrying, and reverse link traffic channel is in common uplink service time slot and special ascending time slot UpPTS carrying, and UpPTS does not carry PUCCH.
Carry out before setting in advance in this step operates in the base station and bring into operation, the result of setting is kept in the base station.When the base station begins to be applied to certain zone, when carrying out the control of data transmit-receive, carry out uplink control signaling transmission control according to the above-mentioned result of setting who in the base station, preserves.
Step 502, when needs transmission upstream control signaling, whether the base station exists common uplink service time slot according to current system, selects to be used to transmit the uplink control signaling channel.
Step 503, subscriber equipment is at base station selected channel upstream control signaling.
So far, method flow provided by the invention finishes.
As seen by above-mentioned, according to whether there being common uplink service time slot in the system, mode concrete when the transmission upstream control signaling is different.Below by specific embodiment explanation the specific embodiment of the present invention.
Fig. 6 is the particular flow sheet of the ascending control signaling transmission method of tdd systems in the embodiment of the invention.As shown in Figure 6, this method comprises:
Step 601 sets in advance PUCCH only in common uplink service time slot carrying, and reverse link traffic channel is in common uplink service time slot and special ascending time slot UpPTS carrying, and UpPTS does not carry PUCCH.
Below, according to whether there being common uplink service time slot in the system, specifically introduce setting up procedure respectively.
The first kind is the situation that has common uplink service time slot, and uplink and downlink timeslot ratio is 1: 3,2: 2 or 3: 1 under the corresponding frame structure shown in Figure 4, and under these uplink and downlink timeslot ratios, the ascending control channel setting up procedure is identical.Be that example describes with 1: 3 uplink and downlink timeslot ratio below.Fig. 7 in the new LTE TDD system frame structure to the schematic diagram that is provided with of ascending control channel.
As shown in Figure 7, two business time-slots in UpPTS and thesubframe 1 are used to carry out uplink.Wherein, for common uplink service time slot, per two uplink service time slots constitute a sub-frame of uplink, adopt the uplink basic structure of LTE system shown in Figure 3.Stage casing in system bandwidth is set to PUSCH, is used to the upstream control signaling that transmits uplink business data and follow; In the reservation frequency band of system bandwidth both sides, a pair of frequency-hopping resource 1a and the 1b that lay respectively in two time slots are used to carry PUCCH.Whole UpPTS is used to carry PUSCH, transmission uplink business data and the upstream control signaling of following.
Second class is 0: 4 for there not being the situation of common uplink service time slot corresponding to uplink and downlink timeslot ratio shown in Figure 4, and Fig. 8 is under this time slot ratio, in new LTE TDD system frame structure to the schematic diagram that is provided with of ascending control channel.
As shown in Figure 8, only have ascending time slot of UpPTS in this frame structure, PUSCH carries on this UpPTS, transmission uplink business data and the upstream control signaling of following.Under the second class uplink and downlink timeslot ratio, there is not PUCCH.
Step 602, when needs transmission upstream control signaling, the base station judges whether to exist common uplink service time slot according to the uplink and downlink timeslot ratio of current system, if having execution instep 603 and subsequent step thereof, otherwise execution instep 607 and subsequent step thereof.
In this step, at first determine the uplink and downlink timeslot ratio of current system,, then show to have common uplink service time slot if uplink and downlink timeslot ratio is 1: 3,2: 2 or 3: 1, if uplink and downlink timeslot ratio is 0: 4, then show not have common uplink service time slot.
Step 603, base station judge whether to exist upstream data, if, execution instep 604 and subsequent step thereof, otherwise execution instep 606.
In this step, if there is upstream data, determine then to be user equipment allocation PUSCH that then execution instep 604 and subsequent step thereof carry out the distribution of PUSCH, and utilize the PUSCH of this distribution to carry out the uplink control signaling transmission; If there is not upstream data, then determining does not need to be user equipment allocation PUCCH, execution instep 606, and subscriber equipment transmits upstream control signaling in advance for the PUCCH that self distributes.
Step 604, the base station sends ascending scheduling control signaling to subscriber equipment, is user equipment allocation PUSCH.
In this step, the base station can send ascending scheduling control signaling to subscriber equipment according to the needs of business, is the dispatching user facility ascending resource, as the PUSCH that distributes to this subscriber equipment.Owing instep 601, set in advance UpPTS and conventional uplink service time slot all can carry PUSCH, so can be arranged in UpPTS and any conventional uplink service time slot for the ascending resource of dispatching user facility in this step.The concrete process of PUSCH of distributing is identical with existing implementation, just repeats no more here.
Step 605, subscriber equipment receive ascending scheduling control signaling, are defined as the PUSCH that self distributes and the uplink control signaling transmission that utilizes this PUSCH to carry out upstream data and follow.
Step 606, base station do not send ascending scheduling control signaling to subscriber equipment, and subscriber equipment transmits upstream control signaling on PUCCH.
In this step,, therefore do not need to be this user equipment allocation PUSCH that the base station can not send ascending scheduling control signaling to subscriber equipment because there is not upstream data in subscriber equipment.Subscriber equipment does not receive ascending scheduling control signaling in the radio frames that receives, determine that promptly the base station is not this user equipment allocation PUSCH, then upstream control signaling is transmitted on pre-assigned PUCCH.The process of specifically allocating PUCCH in advance is identical with existing implementation, just repeats no more here.
So far, there is the situation of common uplink service time slot in correspondence, and the uplink control signaling transfer process finishes.
Step 607, base station judge whether to exist upstream data, if, execution instep 608 and subsequent step thereof, otherwise execution instep 610 and subsequent step thereof.
In this step, if there is upstream data, then execution instep 608 and subsequent step thereof for user equipment allocation is used for transmit ascending data and uplink control signaling PUSCH, and utilize the PUSCH of this distribution to transmit upstream control signaling and upstream data; If there is not a upstream data, then execution instep 610 and subsequent step thereof, for user equipment allocation is used to transmit uplink control signaling PUSCH, subscriber equipment transmits upstream control signaling on the PUSCH for self distribution.
Step 608, the base station sends ascending scheduling control signaling to subscriber equipment, for subscriber equipment distributes PUSCH on UpPTS.
In this step, upstream data that the base station can be transmitted as required and upstream control signaling send ascending scheduling control signaling to subscriber equipment, are the dispatching user facility ascending resource, as the PUSCH that distributes to this subscriber equipment.Because under the second class time slot ratio, only there is ascending time slot of UpPTS in the radio frames, promptly have only UpPTS can carry PUSCH, therefore this step is that the ascending resource of dispatching user facility also is to be arranged in UpPTS, the concrete process of PUSCH of distributing is identical with existing implementation, just repeats no more here.
Step 609, subscriber equipment receive ascending scheduling control signaling, are defined as the PUSCH that self distributes and the uplink control signaling transmission that utilizes this PUSCH to carry out upstream data and follow.
Step 610, base station are user equipment allocation PUSCH.
Instep 601,, PUCCH is not set, promptly when uplink and downlink timeslot ratio is 0: 4, does not have PUCCH, therefore, can't utilize PUCCH to carry out the uplink control signaling transmission at the situation that does not have common uplink service time slot.Therefore, in this step,, be based on PUCCH is not set in the system, still need to be user equipment allocation PUSCH, thereby be used to transmit upstream control signaling though there is not transmitting uplink data.
In this step, when not having upstream data,, below introduce respectively for the mode of user equipment allocation PUSCH has three kinds.
First kind of mode: the base station comprises the dispatch of upstream control signaling feedback channel in sending to the descending scheduling signaling of subscriber equipment, Chuan Shu upstream control signaling is the dispatching user facility ascending resource as required, is used to transmit uplink control signaling PUSCH as what distribute to this subscriber equipment; Under this mode, increased a kind of control signaling format, be used for notifying user equipment upstream control signaling is transmitted on PUSCH separately;
The second way: the base station sends the new ascending scheduling control signaling that sets in advance to subscriber equipment, is used for dispatching UpPTS carrying uplink control signaling ascending resource; Wherein, new ascending scheduling control signaling also is a kind of control signaling format that increases newly, is used for notifying user equipment upstream control signaling is transmitted on PUSCH separately;
The third mode: the base station sends traditional ascending scheduling control signaling to subscriber equipment, is used for dispatching UpPTS carrying uplink control signaling ascending resource; Under this mode, do not increase the control signaling format, still continue to use original ascending scheduling control signaling and distribute PUSCH.
Step 611, subscriber equipment receive the signaling that the base station sends, and are defined as the PUSCH that self distributes, and utilize this PUSCH to carry out the uplink control signaling transmission.
According to three kinds of PUSCH in thestep 610 different methods of salary distribution, determine PUSCH in this step and transmit the also corresponding difference to some extent of uplink control signaling mode, below just be introduced respectively.
First kind of mode in the corresponding step 610: in this step, subscriber equipment receives the descending scheduling signaling, extracts the dispatch of upstream control signaling feedback channel wherein, is defined as the PUSCH that self distributes, with upstream control signaling transmission separately on this PUSCH;
The second way in the corresponding step 610: in this step, subscriber equipment receives the signaling that the base station sends, when determining that this signaling is the new ascending scheduling control signaling that sets in advance, be defined as the carrying uplink control signaling PUSCH of this user equipment allocation according to the ascending resource of dispatching in this signaling, and with upstream control signaling transmission separately on described PUSCH;
The third mode in the corresponding step 610: in this step, subscriber equipment receives the uplink scheduling signaling, according to the ascending resource of dispatching in this signaling, be defined as the PUSCH of this user equipment allocation, when not having upstream data, upstream control signaling and virtual data followed on PUSCH transmit, particularly, the user device transmissions virtual data is given the base station, and carries upstream control signaling in this virtual data.
In above-mentioned three kinds of corresponding PUSCH distribution and upstream control signaling transmission means, in the first kind of mode and the second way, when the user device transmissions upstream control signaling, can will should the control signaling on the PUSCH that distributes, transmit separately, improved efficiency of transmission with respect to the form of following transmission, but this dual mode all needs to increase new control signaling format, be respectively improved descending scheduling signaling and newly-increased uplink scheduling signaling, subscriber equipment needs to carry out different processing according to whether having upstream data; In the third mode, do not need to increase new control signaling format, the processing of the processing procedure of subscriber equipment when having upstream data is just the same, does not need to increase extra processing procedure, reduces the complexity that realizes; But upstream control signaling and virtual data need be followed transmission, so the uplink control signaling efficiency of transmission is low slightly.
So far, the corresponding situation that does not have common uplink service time slot, the uplink control signaling transfer process finishes.The whole flow process of the upstream control signaling transmission that present embodiment provides finishes.
By above-mentioned flow process as seen, use mode of the present invention, can guarantee under the different time-gap ratio,, can guarantee the uplink control signaling normal transmission though the length of UpPTS time slot constantly changes.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.