CN102438307A - Method for sending power control command - Google Patents
Method for sending power control command Download PDFInfo
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- CN102438307A CN102438307A CN2010105065288A CN201010506528A CN102438307A CN 102438307 A CN102438307 A CN 102438307A CN 2010105065288 A CN2010105065288 A CN 2010105065288A CN 201010506528 A CN201010506528 A CN 201010506528A CN 102438307 A CN102438307 A CN 102438307A
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Abstract
The invention provides a method for sending a power control command. In a PDCCH ( physical downlink control channel) capable of dispatching SIMO (single input multiple output), a 3-bit TPC (transmission power control) command and 1-bit RV (redundancy version) information are sent through a TPC region and an RV region; and in a PDCCH capable of dispatching MIMO (multiple input multiple output), a 3-bit TPC command and two pieces of single-bit RV (redundancy version) information are sent through a TPC region and an RV region. By utilizing the method provided by the invention, the UE (user equipment) transmission power control range of a base station is enlarged, and the ACK/NACK (acknowledgement/negative-acknowledgement) channel allocation flexibility of the base station is enhanced.
Description
Technical field
The present invention relates to wireless communication system, particularly a kind of method to subscriber equipment (UE) transmission power control commands of supporting carrier combination (CA).
Background technology
At present, the maximum bandwidth of Long Term Evolution (LTE) system is 20MHz, in order to satisfy the more demand of high data rate, on the basis of LTE, has proposed enhancing Long Term Evolution (LTE-A) system again.In the LTE-A system, obtain bigger bandwidth of operation through making up a plurality of unit carrier wave (CC), constitute communication system down link and up link respectively, i.e. carrier combination (CA) technology, thus support higher transmission rate.For example, in order to support the bandwidth of 100MHz, can obtain through the CC that makes up 5 20MHz.
Based on CA; Downlink data is sent to same user terminal (UE) in the base station on a plurality of CC; Correspondingly; UE need support to send the automatic repeat requests of mixing (HARQ) feedback information to the downlink data that on a plurality of CC, sends, and promptly feedback receives successfully (ACK) or (NACK) information that takes defeat, and in subsequent descriptions, is expressed as ACK/NACK information.In LTE, defined 4 different redundancy versions, be used for increasing the HARQ transfer of data of redundant (IR).Specifically, in the Physical Downlink Control Channel (PDCCH) of dispatching downlink data with the redundancy versions of 2 bits transmission blocks of indication (TB).
According to the discussion result of present LTE-A, go up the ACK/NACK information of transfer of data to each CC and on a up CC, send, promptly need send the ACK/NACK information of many bits.For example, in LTE-A, adopted a kind of channel format of new ACK/NACK information, promptly based on the ascending control channel form of the OFDM (DFT-S-OFDM) of DFT expansion.UE can change the method for feeding back ACK/NACK channel according to whether having received the data of SCC when feeding back ACK/nack message.Be specially: when UE only received downlink data on PCC, scene and LTE were similar, and UE can be according to the method for LTE according to the definite PUCCH form 1a/1b channel that will use of PDCCH, thereby comes feeding back ACK/nack message with the method among the LTE; When UE has received a SCC at least, this UE real work is described under the CA pattern, then can confirm PUCCH form 3 channels that will use according to ACK/NACK information resources indication (ARI), thus on the channel of confirming feeding back ACK/nack message.According to the discussion result of present LTE-A, the sending method of a kind of ARI is through-put power control (TPC) territory among the multiplexing PDCCH.Be specially: transmission power control commands still in the TPC territory of the PDCCH of PCC guarantees that the base station can control the transmitting power of UE; Simultaneously, in the TPC territory of the PDCCH of SCC, send ARI.
In LTE-A, the base station is through high-level signaling configuration UE downlink data receiving on a plurality of CC, and the CC quantity of actual schedule can be less than or equal to the high-rise CC quantity that disposes in a sub-frame.Such as, the CC quantity through the high-level signaling configuration among Fig. 1 is 4, is respectively CC1 to CC4, and CC of base station actual schedule, i.e. CC1.For another example, the CC quantity through the high-level signaling configuration among Fig. 2 is 4, is respectively CC1 to CC4, and 3 CC of base station actual schedule, i.e. CC0, CC1 and CC2.In a plurality of descending CC of base station through the high-level signaling configuration, one of them is main CC (PCC), and other CC are called time CC (SCC).
According to the discussion result of present LTE-A, UE fixes the form of confirming feeding back ACK/NACK according to the transmission mode of the CC number of high level configuration and each CC.And; Owing in the PDCCH of dispatching downlink data, do not comprise the information of the DAI among the similar LTE; Thereby can not notify UE is the total number of the downlink data of UE scheduling in the current time base station; UE can not know the number of effective ACK/NACK bit of current actual needs feedback in other words, so UE does not have enough information to come according to the effective ACK/NACK bit number of current reality optimum transmitting power to be set.
In LTE; In order to realize power control to Physical Uplink Control Channel (PUCCH); The method that adopts is through-put power control (TPC) order that in the PDCCH of dispatching downlink data, comprises 2 bits; Corresponding power control value is [1013] dB, expression can for-1,0,1 or 3dB in one.This TPC order can be used to compensate the variable power of above-mentioned significant bit number of variations needs, but the dynamic range of this 2 bit TPC order is too little, is not enough to follow the tracks of rapidly the variation of bit number.For instance,, the transmitting power of current UE supports 1 bit ACK/NACK transmission, if base station decision suddenly amounts to the ACK/NACK amount of information of 10 bits for 5 CC of UE scheduling if being stabilized in.UE needs the feedack amount to increase by 10 times, but 2 bit TPC order can only increase the power of 3dB at most, so be not enough to guarantee the correct reception to 10 bit ACK/NACK.
Summary of the invention
The invention provides a kind of method to subscriber equipment (UE) transmission power control commands of supporting CA.Make the base station that the ACK/NACK channel transmitting power of UE can rationally be set according to effective ACK/NACK bit number of the actual transmission of UE.
Technical scheme of the present invention is achieved in that
A kind of method of transmission power control commands, this method comprises:
The base station is a UE allocation of downlink data transmission resources on one or more unit carrier wave CC;
The physical downlink control channel PDCCH that the said one or more unit carrier wave CC of scheduling go up data is sent in the base station;
Overcharge in the physical downlink control channel PDCCH of SIMO at the scheduling single-shot, 3 bit TPC order and 1 bit RV information are sent through through-put power control TPC territory and redundancy versions RV territory in the base station;
In the PDCCH of scheduling MIMO MIMO, 3 bit TPC order and two single-bit RV information are sent through through-put power control TPC territory and redundancy versions RV territory in the base station.
Through method provided by the invention; Be used to dispatch SIMO or be used to dispatch MIMO adopt different modes according to PDCCH; Through multiplexing TPC territory and RV territory; Obtain 3 bit TPC order, thereby increase the control range and the flexibility that increased base station assigns ACK/NACK channel of base station the transmitting power of UE.
Description of drawings
Fig. 1 is the sketch map of a CC of base station scheduling;
Fig. 2 is the sketch map of three CC of base station scheduling;
Fig. 3 is a main method flow chart provided by the invention;
Fig. 4 is the flow chart of the PDCCH of base station processes PCC and SCC;
Fig. 5 is the flow chart that UE handles the PDCCH of PCC and SCC.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Based on the downlink data communication of CA generally all is to be purpose with higher peak rate and bigger downlink throughput capacity, so for the UE based on CA, it is fewer that its number of times that retransmits to HARQ of downlink data transmission generally can be controlled.In typical case, only needing HARQ to retransmit to the downlink data transmission based on the UE of CA just can be successful.Under the situation of CA, only need 1 bit redundancy versions (RV) information just to can be good at having supported downlink data transmission.
In view of in LTE, the RV territory among the PDCCH is a dibit.Based on top analysis, overcharge the PDCCH form of (SIMO) to dispatching single-shot, have only a RV territory, then can obtain the bit of a redundancy; PDCCH form to scheduling MIMO (MIMO) wherein has two RV territories, then can use this method to obtain the bit of two redundancies.These redundant bits combine existing dibit TPC order can be used to the power control information of indicating dynamic range bigger.
Based on above-mentioned analysis, the present invention provides the main method of transmission power control commands to comprise: in the PDCCH of scheduling SIMO, send 3 bit TPC order and 1 bit RV information through existing TPC territory and RV territory; In the PDCCH of scheduling MIMO, send 3 bit TPC order and two single-bit RV information through existing TPC territory and two RV territories.Specifically, to the PDCCH of scheduling SIMO, the RV information of sending 1 bit, and formed 3 bit TPC with the bit in two bits in TPC territory and another RV territory and ordered.To the PDCCH of scheduling MIMO, send the RV information of two single-bit, and formed 3 bit TPC order with two bits in TPC territory and the bit in a RV territory.
Correspondingly, the main method that the UE end obtains the TPC order can comprise: in the PDCCH of scheduling SIMO, obtain 3 bit TPC order and single-bit RV information through TPC territory and RV territory; In the PDCCH of scheduling MIMO, obtain 3 bit TPC order and two single-bit RV information through TPC territory and RV territory.
It should be noted that the PDCCH to above-mentioned scheduling MIMO, multiplexing existing TPC territory and RV territory after sending 2 single-bit RV, can have maximum 4 bits to be used to carry the TPC order.Here for unified with the situation of SIMO, thereby the simplified system setting can consider still to use 3 bit TPC order.The present invention does not limit the usage of remaining idle bit.
Adopt method of the present invention,, support the power control command of 3 bits the situation of CA.8 values of this power control command can be fixed, promptly have nothing to do with the CC number of the current configuration of UE and the transmission mode of each CC, for example, [5 ,-3 ,-101357].Perhaps, also can dispose 8 values of this power control command according to the transmission mode of CC number He each CC of the current configuration of UE.Here, can confirm the maximum number and the minimal amount of effective ACK/NACK bit according to the transmission mode of the CC number of the current configuration of UE and each CC.For example, suppose that UE has disposed 5 CC and transmission mode all is MIMO, then the maximum ACK/NACK bit number of UE is 10; Simultaneously, the minimum ACK/NACK bit number of the feedback of UE is 1, and this generally occurs in the situation that the base station has only been dispatched data and only sent a TB on a CC.Effective ACK/NACK bit number of the actual transmission of UE possibly be any one value in 1～10.Again for example; Suppose that the transmission mode that UE has disposed 2 CC and a CC all is MIMO; Then the maximum ACK/NACK bit number of UE is 4, and minimum ACK/NACK bit number is 1, i.e. effective ACK/NACK bit number of the actual transmission of UE possibly be any one value in 1～4.So when the TPC of configuration UE order, can combine the dynamic range of effective ACK/NACK bit number of UE actual capabilities transmission to be provided with.When the ACK/NACK of UE number of variations scope is big, can disposes the TPC order and support bigger dynamic range and thicker granularity; Accordingly, when the ACK/NACK of UE number of variations scope is little, can disposes the TPC order and support smaller dynamic range and thinner granularity.For example UE has been disposed the situation of 5 CC, the value of TPC order can be [5 ,-3 ,-101357], and to having disposed the situation of 2 CC, the TPC order can be [3-2-101234].
The corresponding flow chart of above-mentioned main method can be as shown in Figure 3:
Step 301: according to the PDCCH form is to be used for SIMO or MIMO handles respectively, for the PDCCH execution in step 302 of scheduling SIMO, for the PDCCH execution in step 303 of scheduling MIMO.
Step 302: in the PDCCH of scheduling SIMO, send 3 bit TPC order and 1 bit RV information through existing TPC territory and RV territory.
Step 303: in the PDCCH of scheduling MIMO, send 3 bit TPC order and two single-bit RV information through existing TPC territory and two RV territories.
In fact according to the discussion among the present LTE-A; Be to utilize the TPC territory of the PDCCH of scheduling SCC to carry ARI information; The method of expansion TPC of the present invention order can directly be expanded and be used to strengthen the transmission of supporting ARI information; Promptly to the PDCCH of scheduling SCC, the 3 bit TPC order that the inventive method obtains can be used to indicate the ARI information of 3 bits, thereby increases the flexibility of ARI indication.One embodiment of the present of invention are described below: the base station adopts diverse ways to handle the PDCCH of PCC and SCC.As shown in Figure 4, mainly may further comprise the steps:
Step 401: the base station is UE allocation of downlink data transmission resources on one or more CC.
Here the base station downstream data channel that possibly only distribute PCC for UE, the downstream data channel of perhaps only having distributed SCC, perhaps the while has been distributed downstream data channel on PCC and SCC.
Step 402: according to the scheduling result of step 401, the PDCCH that each CC of scheduling goes up data is sent in the base station, and wherein, in the PDCCH of PCC, the base station is sent 3 bit TPC order and is the RV information of each TB transmission single-bit through existing TPC territory and RV territory.And in the PDCCH of SCC, the base station is sent 3 bit A RI information through existing TPC territory and RV territory and is sent the RV information of single-bit for each TB.The method shown in Fig. 3 for example.
Step 403: the base station is according to the control information of indicating among current scheduling result and the PDCCH, on each CC, sends the downlink data of current scheduling for UE.
Step 404: the ACK/NACK feedback information is detected according to the situation of its actual transmission downlink data in the base station.
In this step, when downlink data has only been dispatched for UE in the base station on PCC, only in the PDCCH of PCC, according to receiving ACK/NACK information on the channel that the PUCCH form is corresponding among the existing LTE, i.e. reception ACK/NACK information on PUCCH form 1a/1b channel.When data have only been dispatched for UE in the base station on SCC, reception ACK/NACK information on PUCCH form 3 channels of the indication of the ARI in the PDCCH of SCC only then.When transfer of data has been dispatched simultaneously in the base station on PCC and SCC; The base station is in the PDCCH of PCC; Receive ACK/NACK information on the PUCCH form 1a/1b channel, and blind Detecting ACK/NACK information on PUCCH form 3 channels of the indication of the ARI in the PDCCH of SCC.Here the reason of blind Detecting is: when transfer of data has been dispatched simultaneously in the base station on PCC and SCC; UE might only receive that PCC goes up the data of scheduling, thus can the PDCCH of scheduling PCC according to the corresponding PUCCH form 1a/1b channel of the rule of LTE on feeding back ACK/nack message.
Corresponding with the operation of base station, UE adopts diverse ways to handle the PDCCH of PCC and SCC.As shown in Figure 5, mainly may further comprise the steps:
Step 501:UE receives the PDCCH (UE possibly only receive the PDCCH of PCC, perhaps only receives the PDCCH of SCC, perhaps receives the PDCCH of PCC and SCC simultaneously) that send the base station.When UE received the PDCCH of PCC, UE obtained 3 bit TPC order through existing TPC territory and RV territory and is the RV information of the single-bit of each TB.When UE received the PDCCH of SCC, UE obtained 3 bit A RI information through existing TPC territory and RV territory and is the RV information of the single-bit of each TB.
Step 502:UE receives the downlink data that send the base station according to the control information among each PDCCH that receives on each CC, and generates the ACK/NACK feedback information.
Step 503:UE sends the ACK/NACK feedback information.When UE only receives data on PCC, in the PDCCH of PCC according to LTE in feeding back ACK/nack message, i.e. feeding back ACK/nack message on PUCCH form 1a/1b channel on the corresponding channel of PUCCH form; When UE receives the data at least one SCC, feeding back ACK/nack message on PUCCH form 3 channels of the ARI indication in the PDCCH of SCC.Here, UE orders according to the 3 bit TPC that receive its PUCCH channel transmitting power is set.
Can find out by above description; Through method provided by the invention; Be used to dispatch SIMO or be used to dispatch MIMO adopt different modes according to PDCCH; Through multiplexing TPC territory and RV territory, obtain 3 bit TPC order or 3 bit A RI information, thereby increase the control range and the flexibility that increased base station assigns ACK/NACK channel of base station the transmitting power of UE.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (7)
1. the method for a transmission power control commands is characterized in that, this method comprises:
The base station is a UE allocation of downlink data transmission resources on one or more unit carrier wave CC;
The physical downlink control channel PDCCH that the said one or more unit carrier wave CC of scheduling go up data is sent in the base station;
Overcharge in the physical downlink control channel PDCCH of SIMO at the scheduling single-shot, 3 bit TPC order and RV information are sent through through-put power control TPC territory and redundancy versions RV territory in the base station;
In the PDCCH of scheduling MIMO MIMO, 3 or 4 bit TPC order and RV information are sent through through-put power control TPC territory and redundancy versions RV territory in the base station.
2. method according to claim 1 is characterized in that, described 3 bit TPC order is made up of two bits in TPC territory and a bit in RV territory.
3. method according to claim 1 is characterized in that, described 4 bit TPC order is made up of two bits in TPC territory and two bits in RV territory.
4. method according to claim 1 is characterized in that, the transmission mode of the value of described 3 or 4 bit TPC order and the CC number of the current configuration of UE and each CC is irrelevant.
5. method according to claim 1 is characterized in that, said 3 or the value of 4 bit power control commands dispose according to the CC number of the current configuration of UE and the transmission mode of each CC.
6. according to claim 1 or 2 or 3 described methods, it is characterized in that if said down control channel PDCCH is the PDCCH of scheduling master unit carrier wave PCC, then said 3 bit TPC order is used for the power control to the ACK/NACK channel of UE.
7. according to claim 1 or 2 or 3 described methods, it is characterized in that if said down control channel PDCCH is the PDCCH of scheduling sub-cell carrier wave SCC, then said 3 or 4 bit TPC order is used to carry ACK/NACK information resources indication ARI information.
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| CN2010105065288A CN102438307A (en) | 2010-09-29 | 2010-09-29 | Method for sending power control command |
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| CN2010105065288A CN102438307A (en) | 2010-09-29 | 2010-09-29 | Method for sending power control command |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620523A (en) * | 2012-08-10 | 2015-05-13 | Lg电子株式会社 | Method and apparatus for supporting burst transmission in a wireless communication system |
| WO2019134512A1 (en) * | 2018-01-08 | 2019-07-11 | 电信科学技术研究院有限公司 | Data transmission method, apparatus, and device, and computer readable storage medium |
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2010
- 2010-09-29 CN CN2010105065288A patent/CN102438307A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620523A (en) * | 2012-08-10 | 2015-05-13 | Lg电子株式会社 | Method and apparatus for supporting burst transmission in a wireless communication system |
| WO2019134512A1 (en) * | 2018-01-08 | 2019-07-11 | 电信科学技术研究院有限公司 | Data transmission method, apparatus, and device, and computer readable storage medium |
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Application publication date: 20120502 |