CN101227703A - Device and method for allocating multi-type ACK/NACK channel - Google Patents
Device and method for allocating multi-type ACK/NACK channel Download PDFInfo
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- CN101227703A CN101227703A CNA2007100009701A CN200710000970A CN101227703A CN 101227703 A CN101227703 A CN 101227703A CN A2007100009701 A CNA2007100009701 A CN A2007100009701A CN 200710000970 A CN200710000970 A CN 200710000970A CN 101227703 A CN101227703 A CN 101227703A
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Abstract
The invention relates to equipment and a method for a base station to allocate ACK/NACK channels with various types, and the method comprises the following steps: a base station assures user equipment which is currently dispatched and allocates wireless resource, a transformat which is used when a control signal is sent is selected according to channel condition of user equipment which is currently dispatched and sends control signals, the base station assures the types of an ACK/NACK channel which is allocated to user equipment according to the transformat of the control signals to user equipment and assures the ACK/NACK channel which is allocated to the user equipment. Signal cost for indicating ACK/NACK channels with various types is lowered by adopting the method of the invention.
Description
Technical field
The present invention relates to wireless communication system, relate to a kind of equipment and method of in wireless communication system, distributing polytype ACK/NACK channel in particular.
Background technology
Now, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE).In the middle of numerous physical layer transmission technology, be the focus of research based on the downlink transfer technology of OFDM (OFDM) with based on the uplink technology that single-carrier frequency division multiple access inserts (SCFDMA).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.It on the SCFDMA technological essence a kind of single carrier transmission technology, its signal peak-to-average is lower than (PAPR), thereby the power amplifier of portable terminal can be with higher efficient work, enlarge the coverage of sub-district, by adding Cyclic Prefix (CP) and frequency domain equalization, it is lower that it handles complexity simultaneously.
According to existing discussion result about LTE, be LTE system descending frame structure as shown in Figure 1, Radio Resource in the LTE system is meant time and the frequency resource that system or subscriber equipment can take, can (101-103) do differentiation with radio frames (Radio frame) for unit, the time span of radio frames is identical with the time span of the radio frames of WCDMA system, and promptly its time length is 10ms; Each frame is subdivided into a plurality of time slots (slot) (104-107), and present hypothesis is that each radio frames comprises 20 time slots, and time slots length is 0.5ms; Each time slot comprises a plurality of OFDM symbols again, and according to present hypothesis, the time span of effective OFDM symbol is about 66.7 μ s in the LTE system.The time span of the CP of OFDM symbol can have two kinds, promptly the time span of short CP is approximately 4.8 μ s, the about 16.7 μ s of the time span of long CP, long CP time slot is used for many Cell Broadcast CB/multicasts and the very large situation of radius of society, short CP time slot (108) comprises 7 OFDM symbols, and long CP time slot (109) comprises 6 OFDM symbols.According to present discussion result, Transmission Time Interval (TTI) is 1ms, promptly equals two time slots length.
Fig. 2 is a LTE system uplink frame structure, and with the downlink frame similar, the time span of its radio frames (201,202,203) is all 10ms mutually with WCDMA; Each frame is subdivided into a plurality of time slots (204-207), and present hypothesis is that each radio frames comprises 20 time slots, and time slots length is 0.5ms; Each time slot comprises a plurality of SCFDMA symbols again.In present discussion, two kinds of possible structure of time slot are arranged, first kind of structure is that each time slot comprises two short blocks (Shortblock) and six long (Long block).Second kind of structure is that each time slot only comprises seven LB.According to present discussion result, Transmission Time Interval (TTI) is 1ms, promptly equals two time slots length.Fig. 3 is the signal processing of SCFDMA, transmitting terminal obtains its modulation symbol that need send (301) through certain processing, transform to frequency domain through DFT module (301), be mapped to the sub-carrier positions of system assignment then through subcarrier mapping block (303), next return time domain through IFFT module (304) conversion, then add CP (305), carry out follow-up operation then.Attention is in order to distinguish with the DFT operation of IFFT operation (304) and execution when receiving, and the DFT operation of module (301) is called the Pre-DFT operation.
Discussion result according to current LTE, the physics running time-frequency resource is divided into a plurality of Resource Block (RB), and each Resource Block comprises M continuous sub-carriers on frequency domain, comprises N continuous symbol simultaneously in time, to descending be the OFDM symbol, to up be the SCFDMA symbol.According to the discussion result of current LTE, the value of M is 12, and the value of N depends on the OFDM symbol in the time slot or the number of SCFDMA symbol.
According among the LTE to the result of study of layer one/layer two (L1/L2) control channel, L1/L2 control channel and downstream data channel adopt the structure of Time Division Multiplexing, and the control signaling transmits in preceding n the OFDM of each TTI, wherein n≤3.Here the L1/L2 control channel comprises descending scheduling control channel that is used for the allocation of downlink resource and the uplink scheduling control channel that is used to distribute ascending resource.At least two kinds of transformats of control channel configuration of each specific function promptly dispose different code modulation mode (MCS), and this helps improving the interference between all adjacent sub-district of physical layer resources utilance peace.Different MCS is applicable to the subscriber equipment of different channels condition.Here MCS is two tuples that comprise modulation system and actual coding speed.Modulation system can be QPSK, 16QAM etc.When modulation system one timing, code rate is low more, and is good more to the protection of information bit; When code rate one timing, adopt low-order-modulated mode protecting to information bit.So under the situation that reaches the same link performance, the user that channel condition is good can use than higher code rate transmission; And the user of bad channel conditions need be transmitted with lower code rate.
According to current LTE uplink control signaling is discussed the result, the upstream control signaling here comprises up affirmation/deny information (ACK/NACK), channel quality indication information such as (CQI).When not having transmitting uplink data, upstream control signaling sends on the frequency field of reserving, and as shown in Figure 4, the frequency field of these reservations is distributed in the two ends of frequency band.And in order to utilize the effect of frequency diversity, the upstream control signaling of a subscriber equipment is a time slot transmission at band occupancy two ends respectively in a TTI, promptly or utilize first time slot (401) of frequency band upper end and second time slot (402) of frequency band lower end, perhaps utilize first time slot (403) of frequency band lower end and second time slot (404) on the frequency band.When having transmitting uplink data, upstream control signaling transmits in the uplink data channels resource of base station assigns, and adopts the mode of TDM multiplexing, like this, the upstream data of control information and subscriber equipment was multiplexed into together before Pre-DFT, thereby had kept single-carrier property.
In the LTE system, mixed automatic repeat requests (HARQ) technology is used for transfer of data as a kind of important physical layer transmission technology, and when carrying out the HARQ operation, whether the recipient correctly receives the packet feedback according to it and send ACK/NACK information.To the ascending HARQ transmission, the base station need send descending ACK/NACK information, promptly to the response of transmitting uplink data, transmits hereinafter to be referred as descending ACK/NACK; To descending HARQ transmission, subscriber equipment needs uplink ACK/nack message, promptly to the response of transmitting uplink data, transmits hereinafter to be referred as uplink ACK/NACK.
According to the discussion result of current LTE, the method for descending ACK/NACK transmission can be the method for FDM (frequency division multiplexing) or the method for FDM/CDM (frequency division multiplexing/code division multiplexing).Here FDM is meant that the ACK/NACK of different user devices takies different running time-frequency resources.When ACK/NACK information concentrates on when transmitting in the OFDM symbol, between the different user devices FDM multiplex mode in general sense; When ACK/NACK information is distributed to when transmitting on a plurality of OFDM symbols, the multiplex mode between the different user devices is actually FDM and the mixed mode of using of TDM (time division multiplexing).In below describing above-mentioned two kinds of situations are referred to as the mode of FDM.The method of FDM/CDM is meant the multiplex mode of mixed FDM of use of the ACK/NACK of different user devices and CDM, the resource that promptly is used for ACK/NACK is divided into a plurality of (more than or equal to 2) part from time and frequency, transmits a plurality of ACK/NACK information based on the mode of CDM in each part.
According to the discussion result of current LTE, when not having transmitting uplink data, as shown in Figure 4, ascending control information is in the frequency field transmission of reserving, and current discussion concentrates on the mode that two kinds of multiple access insert, i.e. FDMA or CDMA.Wherein the FDMA access way is the different sub-carrier resources of ascending control information distribution to different user devices; And but the CDMA access way is meant one group of identical subcarrier of a plurality of user equipment allocation distributes different code words, thereby distinguishes a plurality of subscriber equipmenies in the sign indicating number territory.In the discussion of current LTE, be a kind of main alternative sequence of CDMA mode according to the sequence of persevering envelope zero auto-correlation (CAZAC) character.Obtain one group of new sequence by same CAZAC sequence is carried out different cyclic shifts, this group sequence has good their cross correlation, thereby different user equipment allocation uses this to organize different sequences in the new sequence.The number of the value of available here cyclic shift is subject to the maximum multipath time delay of wireless channel.In the discussion of current LTE, when a plurality of Resource Block of system assignment were used for upstream control signaling, a kind of mixed multiplex mode was to be the FDMA multiplex mode between the different Resource Block, is the mode of CDMA in same Resource Block inside.
According among the LTE to the discussion of ACK/NACK channel, the method that the ACK/NACK channel of special user equipment is distributed in indication has explicit indication and implicit indication two class methods.These methods both can be used to transmit uplink ACK/nack message, also can be used to transmit descending ACK/NACK information.The method of first kind of explicit indication is the channel of configure dedicated in transferring ACK/nack message, be used to send the sign and the corresponding ACK/NACK information of subscriber equipment, because customer equipment identification is long, 16 bits for example, and ACK/NACK information generally is a bit, the utilization of resources of this method is very uneconomical, so generally can not use.The method of second kind of explicit indication is the index that comprises the ACK/NACK channel of distributing to this subscriber equipment in the base station is the control signaling of user equipment allocation resource.The ACK/NACK channel of supposing the system configuration add up to N, in the control signaling, need to comprise log so
2(N) individual bit is used to distribute to the index of the ACK/NACK channel of subscriber equipment.The method of first kind of implicit indication be defined as the user equipment allocation resource the control signaling index and distribute to the relation of mapping one by one of index of the ACK/NACK channel of this subscriber equipment.For example, suppose that the base station is that the index that subscriber equipment transmits control channel is k, the index of then distributing to the ACK/NACK channel of this subscriber equipment is k.The method of second kind of implicit indication is according to the implicit index that indicates the ACK/NACK channel of distributing to this subscriber equipment of index that is the Resource Block of user equipment allocation.For example, suppose that it is k that base station assigns is given the index of first Resource Block of subscriber equipment, the index of then distributing to the ACK/NACK channel of this subscriber equipment is k.
The method that the ACK/NACK channel of special user equipment is distributed in aforesaid indication is not utilized the relation of the ACK/NACK channel of the transformat of L1/L2 control channel and distribution, may exist information repeat send, be not the method for the ACK/NACK channel that distributes of optimum indication.
Summary of the invention
The purpose of this invention is to provide a kind of equipment and method of in wireless communication system, distributing polytype ACK/NACK channel
According to an aspect of of the present present invention, the method for the polytype ACK/NACK channel of a kind of base station assigns comprises the steps:
A) subscriber equipment and the distributing radio resource of current scheduling determined in the base station;
Employed transformat when b) base station is selected to send control signaling according to the channel condition of the subscriber equipment of current scheduling, and send control signaling;
C) to a subscriber equipment, the type of its ACK/NACK channel is determined to distribute to according to transformat of its control signaling in the base station, and determines to distribute to the ACK/NACK channel of this subscriber equipment.
According to another aspect of the present invention, the equipment of ACK/NACK channel is handled in a kind of base station, comprises transmission/reception, also comprises:
A) control signaling maker module, be used for determining the transformat of its control channel according to the channel condition of subscriber equipment, and generate the control signaling that to send, and obtain the type of its ACK/NACK channel according to the transformat of the control channel of subscriber equipment, obtain distributing to the index of the ACK/NACK channel of this subscriber equipment;
B) physical channel multiplexer module is used for control signaling, down user data, descending ACK/NACK channel and other physical channels are multiplexed into together;
C) physical channel demodulation multiplexer module is used for demultiplexing uplink user data, uplink ACK/NACK channel and other physical channels.
According to another aspect of the present invention, a kind of subscriber equipment is handled the equipment of ACK/NACK channel, comprises transmission/reception, also comprises:
A) control signaling parser modules, be used to judge whether the base station is that it has sent the control signaling, and the processing controls signaling, and obtain the type of its ACK/NACK channel according to the transformat of its control channel, obtain distributing to the index of the ACK/NACK channel of this subscriber equipment;
B) physical channel demodulation multiplexer module is used for demultiplexing and goes out control channel, down user data, descending ACK/NACK channel and other physical channels;
C) physical channel multiplexer module is used for uplink user data, and uplink ACK/NACK channel and other physical channels are multiplexed into together.
Adopt method of the present invention, reduced the signaling consumption of indicating polytype ACK/NACK channel.
Description of drawings
Fig. 1 is a LTE system descending frame structure;
Fig. 2 is a LTE system uplink frame structure;
Fig. 3 is a SCFDMA Signal Processing process;
Fig. 4 is the structure of ascending control channel;
Fig. 5 is the equipment drawing that ACK/NACK information is handled in the base station;
Fig. 6 is the equipment drawing that subscriber equipment is handled ACK/NACK information;
Fig. 7 is the example of index of the descending ACK/NACK channel of every type of the explicit indication in base station;
Fig. 8 is the example of the index of the subscriber equipment descending ACK/NACK channel of handling every type of explicit indication;
Fig. 9 is the example that the index of the descending ACK/NACK channel of indicating every type is implied in the base station;
Figure 10 is the example that subscriber equipment is handled the index of the descending ACK/NACK channel that implies every type of indication;
Figure 11 is the example that the index of the uplink ACK/NACK channel of indicating every type is implied in the base station;
Figure 12 is the example that subscriber equipment is handled the index of the uplink ACK/NACK channel that implies every type of indication;
Figure 13 is interference coordination is carried out in the base station to the ACK/NACK channel a example;
Figure 14 is the reception example of subscriber equipment when the ACK/NACK channel has been carried out interference coordination.
Embodiment
The present invention proposes a kind of equipment and method of distributing polytype ACK/NACK channel in wireless communication system.The present invention both can be used for the descending ACK/NACK channel of processing response transmitting uplink data, also can be used for the uplink ACK/NACK channel of processing response downlink data transmission.
In wireless communication system, the channel condition difference of subscriber equipment, it also is different being fit to its ACK/NACK transmission of Information mode of transmission.In order to improve the interference of physical resource utilization and equalization interchannel, the ACK/NACK channel of system configuration polytype (comprising two kinds), thereby system classifies to subscriber equipment according to channel condition, and selects the ACK/NACK channel of suitable type.
When adopting FDM multiplex mode configuration ACK/NACK channel, according to the channel condition of subscriber equipment it is classified, be the ACK/NACK channel distribution of the similar subscriber equipment of channel condition one class.Under the preceding topic that guarantees the certain frequency diversity gain, the ACK/NACK channel of the subscriber equipment that the configurating channel condition is good comprises k subcarrier, and the ACK/NACK channel of the subscriber equipment of configurating channel condition difference comprises more subcarrier, for example 2k subcarrier.
When adopting FDM/CDM multiplex mode configuration ACK/NACK channel, according to the channel condition of subscriber equipment it is classified, be the ACK/NACK channel distribution of the similar subscriber equipment of channel condition one class.The temporal frequency resource that the ACK/NACK channel occupancy of inhomogeneous subscriber equipment is different, promptly the multiplex mode with FDM or FDM/TDM sends on different resources; And the ACK/NACK channel of similar subscriber equipment adopts the multiplex mode of CDM to send on identical running time-frequency resource.
To uplink ACK/NACK transmission, consider the covering problem of uplink ACK/NACK channel, dispose polytype ACK/NACK channel and have different transmission time length respectively, wherein the short ACK/NACK channel type of transmission time length is used for the good subscriber equipment of channel condition, and the ACK/NACK channel type that transmission time length is long is used for the subscriber equipment of bad channel conditions.
Method except the polytype ACK/NACK channel of above-described configuration, the method that polytype ACK/NACK channel is handled in another kind of base station is that system carries out interference coordination (interference coordination) to the ACK/NACK channel between neighbor cell, promptly according to the channel condition of subscriber equipment it being classified, is the ACK/NACK channel distribution of the similar subscriber equipment of channel condition one class.Pass through system configuration then, if guarantee that as far as possible a base station sends towards the ACK/NACK channel of the subscriber equipment of bad channel conditions on a part of physical resource, then neighbor cell is at the ACK/NACK channel of this a part of physical resource transmission towards the good subscriber equipment of channel condition.The method of noting interference coordination described herein can be used in combination with other methods that disposes polytype ACK/NACK channel.
According to top analysis, the ACK/NACK channel of system configuration polytype (comprising two kinds), and according to the channel condition of subscriber equipment, be its ACK/NACK channel that distributes suitable type.On the other hand, at least two kinds of transformats of the L1/L2 control channel of each specific function configuration, the base station determines that the foundation of transformat of the control channel of a subscriber equipment also is the channel condition of this subscriber equipment here.Like this, the present invention proposes: to a subscriber equipment, adopted transformat, the type of implicit definite its ACK/NACK channel according to the base station for the L1/L2 control channel of its Resources allocation.The transformat that the present invention does not limit the L1/L2 control channel is corresponding one by one with the type of ACK/NACK channel.The number of the transformat of the L1/L2 control channel of supposing the system definition is M, and the number of the type of ACK/NACK channel is N.When M=N, the transformat of L1/L2 control channel is corresponding one by one with the type of ACK/NACK channel, promptly by the transformat of L1/L2 control channel can be unique the type of definite ACK/NACK channel.When M＞N, the type of the ACK/NACK channel of the transformat correspondence of multiple L1/L2 control channel is identical.When M＜N, the type of the corresponding multiple ACK/NACK channel of a kind of transformat of L1/L2 control channel.The method of the ACK/NACK channel of three kinds of concrete indications distribution of the present invention is below described.
First method of the present invention is: to a subscriber equipment, indicate the type of its ACK/NACK channel for the transformat of the L1/L2 control channel of its Resources allocation by the base station, thereby determined might distribute to the set of the ACK/NACK channel of this subscriber equipment, simultaneously, in its L1/L2 control channel, be transmitted in the index of the ACK/NACK channel that distributes in this set.
Second method of the present invention is: to a subscriber equipment, indicate the type of its ACK/NACK channel for the transformat of the L1/L2 control channel of its Resources allocation by the base station, thereby determined might distribute to the set of the ACK/NACK channel of this subscriber equipment, impliedly determine the index of the ACK/NACK channel of distribution in this set then according to its L1/L2 control channel index.The index of the L1/L2 control channel here is meant the index of a L1/L2 control channel in the L1/L2 of all identical traffic forms control channel.When M=N, determine the type of ACK/NACK channel according to the transformat of L1/L2 control channel after, directly obtain the index of ACK/NACK channel according to the index of L1/L2 control channel.When M＞N, the L1/L2 control channel of the multiple transformat that is mapped to same ACK/NACK channel type is unified numbering, thereby obtain the index of ACK/NACK channel according to its index.For example, the L1/L2 control channel of certain two kinds of transformat is mapped to same ACK/NACK channel type, if the L1/L2 control channel of a subscriber equipment is first kind of transformat so, then obtains the index of ACK/NACK channel according to its index; If the L1/L2 control channel of a subscriber equipment is second kind of transformat, then obtain the index of ACK/NACK channel according to the number of the L1/L2 control channel of its index and first kind of transformat.When M＜N, the type of the corresponding multiple ACK/NACK channel of a kind of transformat of L1/L2 control channel, system can stipulate the mapping order of this polytype ACK/NACK channel, thereby obtains the index of ACK/NACK channel according to the index of L1/L2 control channel.
The third method of the present invention is: to a subscriber equipment, indicate the type of its ACK/NACK channel for the transformat of the L1/L2 control channel of its Resources allocation by the base station, thereby determined might distribute to the set of the ACK/NACK channel of this subscriber equipment, then according to the implicit index of determining the ACK/NACK channel of distribution in this set of index of the Resource Block of the distribution of its L1/L2 control channel indication.
When between the system configuration neighbor cell ACK/NACK channel being carried out interference coordination; method of the present invention is to a subscriber equipment; indicate the type of its ACK/NACK channel for the transformat of the L1/L2 control channel of its Resources allocation by the base station; then according to the method for the concrete interference coordination that uses in base station; ACK/NACK information priority towards the subscriber equipment of bad channel conditions transmits on the reasonable ACK/NACK channel resource of protection, uploads the ACK/NACK information of the chances of losing games to the good subscriber equipment of channel condition at remaining ACK/NACK channel resource then.
A handling process of the up or downlink data transmission of base station scheduling is described below.The subscriber equipment and the distributing radio resource of current scheduling determined according to the information such as data traffic information of the channel quality information and the subscriber equipment of subscriber equipment in the base station.The data traffic information of subscriber equipment is meant the data volume of each subscriber equipment and corresponding quality of service requirement etc.Employed transformat when next L1/L2 control signaling is selected to send according to the channel condition of the subscriber equipment of current scheduling in the base station, and send L1/L2 control signaling.Next, the base station receives or sends the data of subscriber equipment, and promptly to ascending resource scheduling, the base station receives the data of subscriber equipment; To scheduling downlink resource, the base station sends the data of subscriber equipment.Then, to each subscriber equipment, according to method of the present invention, the type of its ACK/NACK channel is determined to distribute in the base station according to the transformat of its L1/L2 control signaling, and determine to distribute to the ACK/NACK channel of this subscriber equipment, and send or receive ACK/NACK information accordingly.The operation that the ACK/NACK channel of this subscriber equipment is determined to distribute in the base station in the above-mentioned flow process is finished before also can advanceing to the operation of data that the base station received or sent subscriber equipment.Be the base station when sending L1/L2 control signaling, determine to distribute to the ACK/NACK channel of this subscriber equipment according to method of the present invention; Next the base station receives or sends the data of subscriber equipment; The base station is corresponding then sends or reception ACK/NACK information.
Corresponding with the operation of base station, the handling process that subscriber equipment is handled up or downlink data transmission is described below.Subscriber equipment at first receives and judges whether the base station is that it has sent L1/L2 control signaling.When subscriber equipment detected the base station and sends to its L1/L2 control signaling, subscriber equipment sent or receives its data message, and promptly to ascending resource scheduling, subscriber equipment sends its data message; To scheduling downlink resource, subscriber equipment receives its data message.Next, subscriber equipment is according to method of the present invention, the transformat that sends to its L1/L2 control channel according to the base station determines that base station assigns gives the type of its ACK/NACK channel, and then determines to distribute to its ACK/NACK channel, and receives or send ACK/NACK information accordingly.The operation that subscriber equipment determines to distribute to its ACK/NACK channel in the above-mentioned flow process is finished before also can advanceing to the operation that subscriber equipment sent or received its data message.Be after subscriber equipment detects the L1/L2 control signaling that the base station sends to it,, to determine to distribute to its ACK/NACK channel according to method of the present invention; Next subscriber equipment sends or receives its data message; Subscriber equipment is corresponding then receives or transmission ACK/NACK information.
Fig. 5 is the equipment drawing that ACK/NACK information is handled in the base station, and wherein controlling signaling maker (504), physical channel multiplexer (505), physical channel demodulation multiplexer (507) is embodiment of the present invention.As shown in Figure 5, the subscriber equipment and the distributing radio resource of current scheduling determined in the base station, then in control signaling maker (504), to the subscriber equipment of each scheduling, the transformat of its control channel is determined according to its channel condition in the base station, and generates the control signaling that will send.To descending scheduling and uplink ACK/NACK transmission, the base station is multiplexing through physical channel multiplexer (505) scheduling control signaling of downlink, user data (501) and other physical channels, launches through emitter (506).Then in control signaling maker (504), subscriber equipment to each descending scheduling, the base station obtains the type of its uplink ACK/NACK channel according to the transformat of its descending scheduling control channel, thereby determine that institute might distribute to the set of the ACK/NACK channel of this subscriber equipment, and then obtain distributing to the index of ACK/NACK channel distribution in this set of this subscriber equipment.Thereby the base station goes out uplink ACK/nack message (508) that each subscriber equipment sends through receiving system (506) and physical channel demodulation multiplexer (507) demultiplexing.To uplink scheduling and descending ACK/NACK transmission, the base station is multiplexing through physical channel multiplexer (505) upstream control signaling, launches through emitter (506).The base station receives the upstream data (509) that the user sends through receiving system (506) and physical channel demodulation multiplexer (507) then.Then in control signaling maker (504), subscriber equipment to each uplink scheduling, the base station obtains the type of its descending ACK/NACK channel according to the transformat of its uplink scheduling control channel, thereby determine that institute might distribute to the set of the ACK/NACK channel of this subscriber equipment, and then obtain distributing to the index of ACK/NACK channel distribution in this set of this subscriber equipment.Then, the base station is multiplexing through physical channel multiplexer (505) descending ACK/NACK information (503), launches through emitter (506).
Fig. 6 is the equipment drawing that subscriber equipment is handled ACK/NACK information, and control signaling resolver (604), physical channel demodulation multiplexer (605), physical channel multiplexer (607) are embodiments of the present invention.As shown in Figure 6, at first, subscriber equipment is through receiving system (606) and physical channel demodulation multiplexer (605), and in control signaling resolver (604), subscriber equipment judges whether the base station is that it has sent the control signaling.If not, subscriber equipment thinks that the base station do not dispatch it and carry out transfer of data, if data are correspondingly received/sent out to subscriber equipment.To descending scheduling and uplink ACK/NACK transmission, subscriber equipment goes out downlink data (601) and generates uplink ACK/nack message (608) through physical channel demodulation multiplexer (605) demultiplexing.Then in control signaling resolver (604), subscriber equipment obtains the type of its uplink ACK/NACK channel according to the transformat of its descending scheduling control channel, thereby determine that institute might distribute to the set of the ACK/NACK channel of this subscriber equipment, and then obtain the ACK/NACK channel of base station assigns to it.Thereby subscriber equipment is multiplexing and launch through emitter (606) through physical channel multiplexer (607) uplink ACK/nack message (608).To uplink scheduling and descending ACK/NACK transmission, subscriber equipment is multiplexing through physical channel multiplexer (607) upstream data (609), launches through emitter (606).Then, in control signaling resolver (604), subscriber equipment obtains the type of its descending ACK/NACK channel according to the transformat of its uplink scheduling control channel, thereby determine that institute might distribute to the set of the ACK/NACK channel of this subscriber equipment, and then obtain distributing to the index of ACK/NACK channel distribution in this set of this subscriber equipment.Then, subscriber equipment obtains the descending ACK/NACK information (603) that the base station sends through physical channel demodulation multiplexer (605) demultiplexing.
Embodiment
This part has provided four embodiment of this invention, and is too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
First embodiment
In the present embodiment, suppose base station scheduling transmitting uplink data and send descending ACK/NACK information based on the FDM multiplex mode.The ACK/NACK channel that the supposing the system configuration is two types, first type is that each ACK/NACK channel comprises k subcarrier, this is mainly used in channel condition subscriber equipment preferably; Second type is that each ACK/NACK channel comprises 2k subcarrier, and this is mainly used in the relatively poor subscriber equipment of channel condition.Here do not distinguish the OFDM technology or the SCFDMA technology of employing.Supposing the system is two kinds of transformats of L1/L2 control signaling configuration, and like this, the transformat of L1/L2 control signaling is corresponding one by one with the type of ACK/NACK channel.And the base station is at the index information of the ACK/NACK channel of distributing to subscriber equipment of L1/L2 control signaling.
Fig. 7 is base station scheduling transmitting uplink data and the flow chart that sends descending ACK/NACK information.As shown in Figure 7, at first the subscriber equipment and the distributing radio resource (701) of current uplink scheduling are determined in the base station.Then, to the subscriber equipment of each uplink scheduling, the transformat of its uplink scheduling control channel is determined according to its channel condition in the base station, and generates the control information that will send, comprising the information (702) of the index of indicating the ACK/NACK channel that distributes.Here the base station obtains the type of its ACK/NACK channel according to the transformat of its control channel, thereby determine that institute might distribute to the set of the ACK/NACK channel of this subscriber equipment, obtain distributing to the index of ACK/NACK channel distribution in this set of this subscriber equipment then.Next, to the subscriber equipment of each uplink scheduling, the base station sends up regulation and control system signaling, and simultaneously the index (703) of the ACK/NACK channel of the transformat of its control channel and its distribution is write down in the base station.Then the base station is according to certain timing relationship, and to the subscriber equipment of each uplink scheduling, the base station receives upstream data (704) distributing on its ascending resource.Then, subscriber equipment to each uplink scheduling, the type of its ACK/NACK channel is determined in the base station according to the transformat of its control channel, and according to the index of ACK/NACK channel in the set of such ACK/NACK channel of its distribution, determine the ACK/NACK channel of this subscriber equipment, thereby send ACK/NACK information (705).
Fig. 8 is the flow chart that subscriber equipment sends upstream data and the descending ACK/NACK information of reception.As shown in Figure 8, at first, subscriber equipment detects each possible uplink scheduling control channel, judges whether the base station is that it has sent ascending scheduling control signaling (801).If not, subscriber equipment thinks that the base station do not dispatch it and carry out transmitting uplink data, if subscriber equipment sends upstream data (802) on the ascending resource of base station assigns.The transformat that subscriber equipment sends to its uplink scheduling control channel according to the base station is determined the type of the descending ACK/NACK channel that the base station sends, and index information of the ACK/NACK channel that distributes in conjunction with the indication in its control signaling determines that base station assigns gives its descending ACK/NACK channel (803).Thereby subscriber equipment receives the descending ACK/NACK information (804) that the base station sends on corresponding downstream ACK/NACK channel.
Second embodiment
In the present embodiment, suppose base station scheduling transmitting uplink data and send descending ACK/NACK information based on the FDM/CDM multiplex mode.The ACK/NACK channel that the supposing the system configuration is two types, this ACK/NACK channel of two types is respectively applied for the subscriber equipment of good subscriber equipment of channel condition and bad channel conditions.This ACK/NACK channel of two types takies different running time-frequency resources respectively, i.e. the multiplex mode of FDM or FDM/TDM.Each ACK/NACK channel of same type adopts the multiplex mode of CDM to send on identical running time-frequency resource, i.e. the corresponding code word of each ACK/NACK channel.System is to the ACK/NACK channel number of same type, and promptly a specific code word represented in each index.Supposing the system is two kinds of transformats of L1/L2 control signaling configuration, and like this, the transformat of L1/L2 control signaling is corresponding one by one with the type of ACK/NACK channel.And hypothesis can obtain distributing to the index of its ACK/NACK channel according to the index of L1/L2 control signaling.
Fig. 9 is base station scheduling transmitting uplink data and the flow chart that sends descending ACK/NACK information.As shown in Figure 9, at first the subscriber equipment and the distributing radio resource (901) of current uplink scheduling are determined in the base station.Then, to the subscriber equipment of each uplink scheduling, the base station generates the uplink scheduling control information that will send, and determines the transformat (902) of its control channel according to its channel condition.Next, to the subscriber equipment of each uplink scheduling, the base station sends up regulation and control system signaling, and the transformat and the index (903) of its control channel write down in the base station simultaneously.Then the base station is according to certain timing relationship, and to the subscriber equipment of each uplink scheduling, the base station receives upstream data (904) distributing on its ascending resource.Then, subscriber equipment to each uplink scheduling, the type of its descending ACK/NACK channel is determined in the base station according to the transformat of its control channel, thereby determine might distribute to the set of the ACK/NACK channel of this subscriber equipment, obtain the index of ACK/NACK channel in the set of such ACK/NACK channel of its distribution then according to the index of its control channel, and then the code word of the ACK/NACK channel correspondence of definite this subscriber equipment, thereby send ACK/NACK information (905).
Figure 10 is the flow chart that subscriber equipment sends upstream data and the descending ACK/NACK information of reception.As shown in figure 10, at first, subscriber equipment detects each possible uplink scheduling control channel, judges whether the base station is that it has sent ascending scheduling control signaling (1001).If not, subscriber equipment thinks that the base station do not dispatch it and carry out transmitting uplink data, if subscriber equipment sends upstream data (1002) on the ascending resource of base station assigns.The transformat that subscriber equipment sends to its control channel according to the base station is determined the type of the descending ACK/NACK channel that the base station sends, thereby determine might distribute to the set of its ACK/NACK channel, obtain the index of ACK/NACK channel in the set of such ACK/NACK channel of its distribution then according to the index of its control channel, thereby determine the code word (1003) of base station assigns to its descending ACK/NACK channel.Subscriber equipment receives the descending ACK/NACK information (1004) that the base station sends on corresponding downstream ACK/NACK channel then.
The 3rd embodiment
In the present embodiment, suppose base station scheduling downlink data transmission and receive uplink ACK/nack message.Uplink ACK/NACK channel that supposing the system definition is two types, first type transmission time length is the length of a TTI, i.e. 1ms, this is mainly used in the relatively poor subscriber equipment of channel condition; Second type transmission time length is 0.5ms, thereby in a TTI, can transmit two ACK/NACK channels with the multiplex mode of TDM, and this is mainly used in channel condition subscriber equipment preferably.Supposing the system is two kinds of transformats of L1/L2 control signaling configuration, and like this, the transformat of L1/L2 control signaling is corresponding one by one with the type of ACK/NACK channel.And hypothesis can obtain distributing to the index of its ACK/NACK channel according to the index of L1/L2 control signaling.
In the LTE system, based on up-link wireless frame structure as shown in Figure 2, with the structure of time slot that comprises 7 LB in each time slot is example, while is based on the structure chart of ascending control channel shown in Figure 4, to second type uplink ACK/NACK channel, because can transmit two ACK/NACK channels, the ACK/NACK channel that paired like this definition is second type with the multiplex mode of TDM in each TTI.Second type uplink ACK/NACK channel has two kinds of define methods in this enforcement.First method: dispose 7 LB of each ACK/NACK channel occupancy, consider the frequency diversity effect, each ACK/NACK channel of second type or in first time slot, take 4 LB and in second time slot, take 3 LB; Perhaps in first time slot, take 3 LB and in second time slot, take 4 LB.Second method: when the up CQI information of different user devices and uplink ACK/nack message send with the mode of CDMA in identical Resource Block, dispose each ACK/NACK channel and only take 6 LB, and the LB that is used to transmit the CQI reference signal in each time slot is not used in transferring ACK/NACK channel, and each ACK/NACK channel of second type takies 3 LB respectively in first time slot and second time slot like this.
Two types ACK/NACK channel can take independently resource as defined above, thereby respectively to every type ACK/NACK channel number.The resource of two types ACK/NACK channel occupancy logically also can be overlapping as defined above.Suppose that a plurality of uplink ACKs/NACK channel takies identical running time-frequency resource based on the mode of CDMA, the number of remembering available code word is N, then can carry N first type ACK/NACK channel on these ascending resources at most, perhaps carry 2N second type ACK/NACK channel at most.At this moment, a kind of method of the ACK/NACK channel number to two types is from different directions this ACK/NACK channel of two types to be numbered respectively.For example, first type ACK/NACK channel is according to the serial number from first code word to N code word; Second type ACK/NACK channel is according to the serial number from N code word to first code word, and two multiplexing ACK/NACK channels of TDM distribute an index respectively on each code word.The base station need guarantee that the resource of two types ACK/NACK channel occupancy of its distribution do not conflict, and the situation of two types ACK/NACK channel occupancy same code word promptly do not occur.
Figure 11 is base station scheduling downlink data transmission and the flow chart that receives uplink ACK/nack message.As shown in figure 11, at first the subscriber equipment and the allocation of downlink Radio Resource (1101) of current descending scheduling are determined in the base station.Then, to the subscriber equipment of each descending scheduling, the base station generates the control information that will send, and determines the transformat (1102) of its control channel according to its channel condition.Next, to the subscriber equipment of each descending scheduling, the base station sends descending regulation and control system signaling, and the transformat and the index (1103) of its control channel write down in the base station simultaneously.Then, to the subscriber equipment of each descending scheduling, the base station sends downlink data (1104) distributing on its downlink resource.Then, subscriber equipment to each descending scheduling, the type of its uplink ACK/NACK channel is determined in the base station according to the transformat of its control channel, thereby determine might distribute to the set of the ACK/NACK channel of this subscriber equipment, obtain the index of ACK/NACK channel in the set of such ACK/NACK channel of its distribution then according to the index of its control channel, and then the ascending resource of the ACK/NACK channel occupancy of definite this subscriber equipment, thereby receive uplink ACK/nack message (1105) that subscriber equipment sends.
Figure 12 is subscriber equipment downlink data receiving and the flow chart that sends uplink ACK/nack message.As shown in figure 12, at first, subscriber equipment detects each possible descending scheduling control channel, judges whether the base station is that it has sent scheduling control signaling of downlink (1201).If not, subscriber equipment thinks that the base station do not dispatch it and carry out downlink data transmission, if subscriber equipment is downlink data receiving (1202) on the downlink resource of base station assigns.The transformat that subscriber equipment sends to its control channel according to the base station is determined the type of the uplink ACK/NACK channel of base station assigns, thereby determine might distribute to the set of its ACK/NACK channel, obtain the index of ACK/NACK channel in the set of such ACK/NACK channel of its distribution then according to the index of its control channel, thereby determine the resource that take (1203) of base station assigns to its uplink ACK/NACK channel.Uplink ACK/nack message (1204) of on corresponding uplink ACK/NACK channel, sending of subscriber equipment then.
The 4th embodiment
In the present embodiment, suppose the base station scheduling transmitting uplink data and send descending ACK/NACK information that each ACK/NACK channel comprises the subcarrier of similar number based on the FDM multiplex mode.And supposing the system is carried out interference coordination to the ACK/NACK channel between adjacent base station.Like this, the ACK/NACK channel of each base station is divided into two classes at least, and hypothesis first kind ACK/NACK channel preferentially is used for the ACK/NACK information of the subscriber equipment of transmission channel conditions difference.When the number of the ACK/NACK channel of the subscriber equipment that is used for bad channel conditions of needs during less than the number of first kind ACK/NACK channel, in the first kind ACK/NACK channel not the ACK/NACK channel of the ACK/NACK channel of usefulness and other types be used for the ACK/NACK information of the good subscriber equipment of transmission channel conditions successively.When the number of the ACK/NACK channel of the subscriber equipment that is used for bad channel conditions of needs during greater than the number of first kind ACK/NACK channel, the ACK/NACK channel of part other types is used to transmit the ACK/NACK information of the subscriber equipment of remaining bad channel conditions, and residual A CK/NACK channel is used for the ACK/NACK information of the good subscriber equipment of transmission channel conditions successively in the ACK/NACK channel of other types.The present embodiment supposing the system is two kinds of transformats of L1/L2 control signaling configuration, and to a subscriber equipment, adopted transformat according to the base station by the L1/L2 control channel of its Resources allocation, determine the type of the ACK/NACK channel that it needs, promptly the ACK/NACK channel is used for the subscriber equipment or the good subscriber equipment of channel condition of bad channel conditions.The method of the interference coordination that attention is adopted according to system, the ACK/NACK channel that the base station priority allocation is first type, the type of the ACK/NACK channel of certain subscriber equipment actual allocated can not be the type of its ACK/NACK channel that needs.Present embodiment hypothesis can obtain distributing to the index of its ACK/NACK channel according to the index of L1/L2 control signaling.
Figure 13 is base station scheduling transmitting uplink data and the flow chart that sends descending ACK/NACK information.As shown in figure 13, at first the subscriber equipment and the distributing radio resource (1301) of current uplink scheduling are determined in the base station.Then, to the subscriber equipment of each uplink scheduling, the base station generates the control information that will send, and determines the transformat (1302) of its control channel according to its channel condition.Next, to the subscriber equipment of each uplink scheduling, the base station sends up regulation and control system signaling, and the transformat and the index (1303) of its control channel write down in the base station simultaneously.Then the base station is according to certain timing relationship, and to the subscriber equipment of each uplink scheduling, the base station receives upstream data (1304) distributing on its ascending resource.Then, to the subscriber equipment of each uplink scheduling, the type of the ACK/NACK channel of its needs is determined according to the transformat of its control channel in the base station, and promptly the ACK/NACK channel is used for the subscriber equipment or the good subscriber equipment of channel condition of bad channel conditions.Then, to the subscriber equipment of bad channel conditions, obtain the index of the ACK/NACK channel of its distribution according to the index of its control channel; The subscriber equipment good to channel condition, the number of the uplink scheduling control channel that sends with the transformat of the subscriber equipment that is used for bad channel conditions according to the index of its control channel and base station obtains the index of the ACK/NACK channel of its distribution, and then the ACK/NACK channel of definite this subscriber equipment, and send ACK/NACK information (1305).
Figure 14 is the flow chart that subscriber equipment sends upstream data and the descending ACK/NACK information of reception.As shown in figure 14, at first, subscriber equipment detects each possible uplink scheduling control channel, judges whether the base station is that it has sent ascending scheduling control signaling (1401).If not, subscriber equipment thinks that the base station do not dispatch it and carry out transmitting uplink data, if subscriber equipment sends upstream data (1402) on the ascending resource of base station assigns.The transformat that subscriber equipment sends to its control channel according to the base station is determined the type of the descending ACK/NACK channel of its needs, and promptly this subscriber equipment belongs to the subscriber equipment of bad channel conditions or belongs to the good subscriber equipment of channel condition.Then, if this subscriber equipment belongs to the subscriber equipment of bad channel conditions, obtain the index of the ACK/NACK channel of its distribution according to the index of its control channel; If this subscriber equipment belongs to the good subscriber equipment of channel condition, the number of the uplink scheduling control channel that sends with the transformat of the subscriber equipment that is used for bad channel conditions according to the index of its control channel and base station obtains the index of the ACK/NACK channel of its distribution, thereby determines that base station assigns gives the code word (1403) of its descending ACK/NACK channel.Subscriber equipment receives the descending ACK/NACK information (1404) that the base station sends on corresponding downstream ACK/NACK channel then.
Claims (21)
1. the method for the polytype ACK/NACK channel of base station assigns comprises step:
A) subscriber equipment and the distributing radio resource of current scheduling determined in the base station;
Employed transformat when b) base station is selected to send control signaling according to the channel condition of the subscriber equipment of current scheduling, and send control signaling;
C) to a subscriber equipment, the type of its ACK/NACK channel is determined to distribute to according to transformat of its control signaling in the base station, and determines to distribute to the ACK/NACK channel of this subscriber equipment.
2. method according to claim 1 is characterized in that also comprising, at step b) and c) between the base station send or receive the data of subscriber equipment, and the base station receives or sends ACK/NACK information after step c).
3. method according to claim 1 is characterized in that also comprising, the base station sends or receive the data of subscriber equipment after step c), and the base station receives or send ACK/NACK information then.
4. method according to claim 1, it is characterized in that in step c), to a subscriber equipment, according to the transformat that control channel adopted of base station for its Resources allocation, the implicit type of determining its ACK/NACK channel, wherein, the number of the transformat of control channel is M, and the number of the type of ACK/NACK channel is N.
5. method according to claim 4 is characterized in that, when M=N, the transformat of L1/L2 control channel is corresponding one by one with the type of ACK/NACK channel.
6. method according to claim 4 is characterized in that, when M＞N, the type of the ACK/NACK channel of the transformat correspondence of multiple L1/L2 control channel is identical.
7. method according to claim 4 is characterized in that, when M＜N, and the type of the corresponding multiple ACK/NACK channel of a kind of transformat of L1/L2 control channel.
8. method according to claim 1 is characterized in that in step c), according to the type of the ACK/NACK channel of subscriber equipment determine might distribute to the set of the ACK/NACK channel of this subscriber equipment.
9. method according to claim 8 is characterized in that, is transmitted in the index of the ACK/NACK channel that distributes in this set in the control channel of subscriber equipment.
10. method according to claim 8 is characterized in that, the index of the ACK/NACK channel that distributes impliedly determined in the index of the control channel of subscriber equipment in this set.
11. method according to claim 8 is characterized in that, the index of determining the ACK/NACK channel that distributes in this set that the index of the Resource Block of the distribution of the control channel indication of subscriber equipment is implicit.
12. method according to claim 1; it is characterized in that in step c); method according to the concrete interference coordination that uses in base station; ACK/NACK information priority towards the subscriber equipment of bad channel conditions is transmitted on the reasonable ACK/NACK channel resource of protection, upload the ACK/NACK information of the chances of losing games at remaining ACK/NACK channel resource then to the good subscriber equipment of channel condition.
13. a subscriber equipment is handled the method for polytype ACK/NACK channel, comprises step:
A) subscriber equipment receives and judges whether the base station is that it has sent the control signaling;
B) subscriber equipment is determined the type of the ACK/NACK channel of base station assigns according to the transformat that the base station sends to its control channel, and determines to distribute to the ACK/NACK channel of this subscriber equipment.
14. method according to claim 1 is characterized in that also comprising, at step a) and b) between subscriber equipment send or receive its data message, and subscriber equipment receives or sends ACK/NACK information after step b).
15. method according to claim 1 is characterized in that also comprising, subscriber equipment sends or receives its data message after step b), and subscriber equipment receives or send ACK/NACK information then.
16. method according to claim 13 is characterized in that, in step b), the type decided of the ACK/NACK channel of subscriber equipment might distribute to the set of its ACK/NACK channel.
17. method according to claim 16 is characterized in that, is transmitted in the index of the ACK/NACK channel that distributes in this set in the control channel of subscriber equipment.
18. method according to claim 16 is characterized in that, the index of the ACK/NACK channel that distributes impliedly determined in the index of the control channel of subscriber equipment in this set.
19. method according to claim 16 is characterized in that, the index of determining the ACK/NACK channel that distributes in this set that the index of the Resource Block of the distribution of the control channel indication of subscriber equipment is implicit.
20. the equipment of ACK/NACK channel is handled in a base station, comprises transmission/reception, also comprises:
A) control signaling maker module, be used for determining the transformat of its control channel according to the channel condition of subscriber equipment, and generate the control signaling that to send, and obtain the type of its ACK/NACK channel, and obtain distributing to the index of the ACK/NACK channel of this subscriber equipment according to the transformat of the control channel of subscriber equipment;
B) physical channel multiplexer module is used for control signaling, down user data, descending ACK/NACK channel and other physical channels are multiplexed into together;
C) physical channel demodulation multiplexer module is used for demultiplexing uplink user data, uplink ACK/NACK channel and other physical channels.
21. a subscriber equipment is handled the equipment of ACK/NACK channel, comprises transmission/reception, also comprises:
A) control signaling parser modules is used to judge whether the base station is that it has sent the control signaling, and the processing controls signaling; And obtain the type of its ACK/NACK channel, and obtain distributing to the index of the ACK/NACK channel of this subscriber equipment according to the transformat of its control channel;
B) physical channel demodulation multiplexer module is used for demultiplexing and goes out control channel, down user data, descending ACK/NACK channel and other physical channels;
C) physical channel multiplexer module is used for uplink user data, and uplink ACK/NACK channel and other physical channels are multiplexed into together.
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