CN102036394A - Method for transmitting channel quality information and system - Google Patents
Method for transmitting channel quality information and system Download PDFInfo
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- CN102036394A CN102036394A CN2009102352606A CN200910235260A CN102036394A CN 102036394 A CN102036394 A CN 102036394A CN 2009102352606 A CN2009102352606 A CN 2009102352606A CN 200910235260 A CN200910235260 A CN 200910235260A CN 102036394 A CN102036394 A CN 102036394A
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Abstract
The invention discloses a method for transmitting channel quality information (CQI), which is used for improving the uploading efficiency of the CQI and saving the network resources. The method comprises the following steps: a base station generates channel quality feedback instructions, wherein the channel quality feedback instructions comprise the feedback format, the feedback content, data orthogonal spread spectrum sequence index numbers and a physical resource block index number; and the base station sends the channel quality feedback instructions to user equipment (UE) and indicates the UE to generate the CQI according to the feedback content and the data orthogonal spread spectrum sequence index numbers and feed back the CQI on the physical resource block corresponding to the physical resource block index number according to the feedback format, wherein the channel quality feedback instructions sent to different UE carry different data orthogonal spread spectrum sequence index numbers; and the CQI generated by a plurality of UE is transmitted in the same physical resource block. The invention also discloses a system for realizing the method.
Description
Technical field
The present invention relates to the communications field, particularly relate to the method and system of transmission of channel quality information.
Background technology
In the development of Communication Technique process, how to improve the transmission performance of network, be the long-term in the industry problem of paying close attention to always.
Subscriber equipment (UE) need by the indication of up channel feedback channel quality (Channel QualityIndicator, CQI).The base station utilizes the CQI of UE feedback to carry out the dynamic dispatching of downlink resource.The CQI feedback is divided into: feed back periodic feedback CQI and aperiodic two kinds of CQI.For periodic feedback CQI, after the base station once disposed by Radio Resource control (RRC) signaling, UE periodically carried out the CQI feedback just according to the configuration of base station, up to the base station it is reconfigured or UE switches under other base station, and to feed back employed resource be constant.For feeding back CQI aperiodic, descending control signaling is passed through in the base station, dynamic dispatching UE reports, UE only receive trigger the descending control signaling that aperiodic, CQI reported after, according to the transmission of the relevant configuration in a descending control signaling CQI aperiodic, feed back employed resource this moment is each dynamic dispatching.
In the long evolving system (3GPP LTE-A) of the upgrading of third generation communication system, in order to support more high-end transmission means, UE may need to feed back more CQI bit number.In 3GPP LTE-A, the coded data of physical uplink control channel (PUCCH) CQI of version 8 (Rel-8) is 20 bits, and its transmission mode can not be supported the demand of CQI feedback effectively.The coded data of Rel-8 physical uplink link sharing channel (PUSCH) CQI is 288 bits, because a PRB can only give a UE, then this transmission mode can cause the increase of CQI feedback overhead.
Summary of the invention
The embodiment of the invention provides a kind of method and system of transmission of channel quality information, is used to improve the last transfer efficiency of channel quality information, saves Internet resources.
A kind of method of transmission of channel quality information may further comprise the steps:
The base station generates the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number;
The base station is to the instruction of user equipment (UE) transmitting channel quality feedback, and indication UE generates channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers, the channel quality information that a plurality of UE generate transmits in same Physical Resource Block.
A kind of base station comprises:
Control module is used to generate the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number;
Interface module, be used for instructing to user equipment (UE) transmitting channel quality feedback, indication UE generates channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers, the channel quality information that a plurality of UE generate transmits in same Physical Resource Block.
A kind of communication system comprises:
The base station is used to generate the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number, and instructs to user equipment (UE) transmitting channel quality feedback; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers;
UE is used for generating channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, the channel quality information of a plurality of UE generations transmits in same Physical Resource Block.
The base station sends different data orthogonal spreading sequence call numbers to different UE in the embodiment of the invention, the channel quality information that different UEs basis data orthogonal spreading sequence call number is separately obtained can transmit on same PRB, thereby improved the last transfer efficiency of channel quality information, saved Internet resources.
Description of drawings
Fig. 1 is the structure chart of communication system in the embodiment of the invention;
Fig. 2 is the schematic diagram of no frequency hopping mapping in the embodiment of the invention;
Fig. 3 is the schematic diagram of frequency hopping mapping in the embodiment of the invention;
Fig. 4 is the structure chart of base station in the embodiment of the invention;
Fig. 5 is the flow chart of transmission of channel quality information in the embodiment of the invention;
Fig. 6 is the schematic diagram of resource pool and spread spectrum coefficient in the embodiment of the invention;
Fig. 7 is the schematic diagram of joint index in the embodiment of the invention;
Fig. 8 is for carrying out the schematic diagram of spread spectrum to frequency pilot sign in the embodiment of the invention.
Embodiment
The base station sends data orthogonal spreading sequence length and data orthogonal spreading sequence call number to UE in the embodiment of the invention, UE is according to data orthogonal spreading sequence call number specified data orthogonal spreading sequence in indication, and carry out spread spectrum according to the data orthogonal spreading sequence, generate channel quality information and feedback.Because data orthogonal spreading sequence length is at least 2, so data orthogonal spreading sequence call number has 2 at least.The base station sends different data orthogonal spreading sequence call numbers to different UE, realizes that the channel quality information that different UEs generates can transmit in same Physical Resource Block (PRB), thereby has improved the last transfer efficiency of channel quality information, has saved Internet resources.
Referring to Fig. 1, the communication system in the present embodiment comprises base station and UE.This base station can be specially evolution base station (eNB) etc.
The base station is used to generate the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and PRB call number, and instructs to user equipment (UE) transmitting channel quality feedback; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers.The data orthogonal spreading sequence is the employed orthogonal spreading sequences of data in the present embodiment, and the demodulation pilot frequency frequency expansion sequence is the employed frequency expansion sequence of demodulation pilot frequency.Data orthogonal spreading sequence length is not less than 2 in the present embodiment.
UE is used for generating channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on the PRB of PRB call number correspondence according to feedback format; Wherein, the channel quality information of a plurality of UE generations transmits in same Physical Resource Block.In the present embodiment, channel quality information shared bit number in same Physical Resource Block that different UEs generates is no more than the ratio of the size and the data orthogonal spreading sequence length of Physical Resource Block.Channel quality information in the present embodiment comprises channel quality indication (channelquality indicator, CQI), pre-coding matrix indication (Percoding Matrix Indicator, PMI) and channel sequence indication (Rank Indicator, RI) in one or multinomial, can also comprise other information about channel quality.
For example, a PRB goes up and supports 2 UE transmission of channel quality information.Data orthogonal spreading sequence length is 2, and the data orthogonal spreading sequence comprises [W1, W2] and [W1 ', W2 '], and [W1, W2] and [W1 ', W2 '] quadrature are [1,1] as [W1, W2], [W1 ', W2 '] be [1 ,-1].With the PRB on the PUSCH is example, uses QPSK to modulate, and can carry 288 coded-bits among this PRB, and then the number of coded bits of the channel quality information of each UE generation is 144.UE generates channel quality information after multiply by the data orthogonal spreading sequence of self correspondence by the channel quality data symbol, and is transferred to the base station by PRB.Referring to Fig. 2 and transmission schematic diagram shown in Figure 3, channel quality data symbol D1, D2 and the D3 of UE1 multiply by respectively (promptly
) [W1, W2], the channel quality information that obtains is mapped on the time slot 0 (Slot0) of PRB, and wherein RS represents frequency pilot sign.Channel quality data symbol D4, D5 and the D6 of UE2 multiply by respectively (promptly
) [W1 ', W2 '], the channel quality information that obtains is mapped on the time slot 1 (Slot1) of PRB.The channel quality information of UE1 and UE2 transmits on same frequency among Fig. 2, and the channel quality information of UE1 and UE2 transmits (being called frequency hopping) among Fig. 3 on different frequency.
Wherein, the base station comprises control module 401 and interface module 402, referring to shown in Figure 4.
The base station also comprises generation module 403, is used for generating data orthogonal spreading sequence call number, data orthogonal spreading sequence length and Physical Resource Block call number respectively according to the absolute coding mode.The bit number that data orthogonal spreading sequence call number takies in signaling is
K is the quantity of available data orthogonal spreading sequence,
Expression rounds up.The bit number that data orthogonal spreading sequence length takies in signaling is
M is the sum of the spread spectrum coefficient of communication system support,
Expression rounds up.The bit number that the Physical Resource Block call number takies is
B is the quantity of available physical resources piece,
Expression rounds up.Perhaps generation module 403 generates joint index number according to the combined coding mode; Control module 401 is determined joint indexs number; Interface module 402 sends joint index number to UE, and this joint index number is represented data orthogonal spreading sequence call number and Physical Resource Block call number etc. simultaneously.
Perhaps control module 401 uncertain demodulation pilot frequency frequency expansion sequence call numbers, interface module 402 sends data orthogonal spreading sequence call number to UE, also be used to indicate UE to determine demodulation pilot frequency frequency expansion sequence call number, and determine the demodulation pilot frequency frequency expansion sequence and carry out spread spectrum according to demodulation pilot frequency frequency expansion sequence call number according to data orthogonal spreading sequence call number.
More than be introduction, introduce the implementation procedure of transmission of channel quality information below communication system and base station.
Referring to Fig. 5, the method flow of transmission of channel quality information is as follows in the present embodiment:
Step 501: the base station generates the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number.Which channel quality information is feedback content promptly specifically feed back, as feedback CQI or feedback CQI and PMI etc.Feedback format can comprise feedback content, and different feedback content may need different feedback format.The base station sends feedback format to UE, and UE just knows needs which channel quality information of feedback and with what form feeds back.Can also promptly notify UE feedback format with feedback format and transmission mode binding by sending transmission mode to UE.
Step 502: the base station is to the instruction of UE transmitting channel quality feedback, and indication UE generates channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers, the channel quality information that a plurality of UE generate transmits in same Physical Resource Block.
If communication system is only supported a kind of data orthogonal spreading sequence of length, then can for all available data orthogonal spreading sequences data orthogonal spreading sequence call number be set in advance, base station and UE all preserve the corresponding relation of each data orthogonal spreading sequence call number and data orthogonal spreading sequence.The bit number that data orthogonal spreading sequence call number takies in signaling is
K is the quantity of available data orthogonal spreading sequence,
Expression rounds up.
If communication system is supported the data orthogonal spreading sequence of multiple length, then the base station also needs to send spread spectrum coefficient (SF) to UE, promptly sends data orthogonal spreading sequence length.The bit number that data orthogonal spreading sequence length takies in signaling is
M is the sum of the spread spectrum coefficient of communication system support.A kind of data orthogonal spreading sequence of length can only be supported in each sub-district, also can support the data orthogonal spreading sequence of multiple length.Referring to shown in Figure 6, different resource pool (carrying constitutes a resource pool with a kind of PRB of data orthogonal spreading sequence of length) can corresponding different spread spectrum coefficients, and N1, N2 and N3 represent the resource original position of 3 resource pools.Can adopt the absolute coding mode between the resource pool.Absolute coding is meant the coding of each resource pool all since 1 (or 0), and this kind mode need be notified the original position (as N2 etc.) of this resource pool of UE.
If communication system adopts a fixing PRB transmission of channel quality information, then the base station does not need to send PRB information to UE, and by configuration, two ends know in advance that all which PRB is used for transmission of channel quality information.
If communication system adopts fixing a plurality of PRB transmission of channel quality information, then the base station need send the PRB call number to UE, indication UE transmission of channel quality information on the PRB of PRB call number sign.The bit number that the PRB call number takies in signaling is
B is the quantity of all available PRB.What more than PRB call number of Jie Shaoing and data orthogonal spreading sequence call number adopted is the absolute coding mode, and call number is separately promptly arranged respectively.PRB call number and data orthogonal spreading sequence call number can number be represented by joint index, promptly adopt the combined coding mode.As the PRB call number by PRB
NTo PRB
N+n-1, data orthogonal spreading sequence call number comprises S
0, S
1... S
K-1, then have kn available resources, resource r in the communication system
Ki+j→ (PRB
i, S
j), i=0 wherein, 1...n-1, j=0,1 ... k-1, referring to shown in Figure 7.When the original position N of base station notice UE resource pool and joint index ki+j, then UE will be at PRB
N+iLast use frequency expansion sequence S
jCarry out spread spectrum.
If communication system does not adopt fixing PRB transmission of channel quality information, then the base station need send the PRB call number to UE, indication UE transmission of channel quality information on the PRB of PRB call number sign.Spread spectrum coefficient, PRB call number and data orthogonal spreading sequence call number also can combined codings, and method is with the combined coding of PRB call number and data orthogonal spreading sequence call number.
The base station can also send feedback cycle and skew to UE, unite in feedback sign, frequency hopping sign and the demodulation pilot frequency frequency expansion sequence call number one or multinomial.
If wish the periodic feedback channel quality information, then the base station also needs to send feedback cycle and skew to UE.For example, pick up counting from 0ms, skew is 2, and feedback cycle is 10, then indicates UE from 2ms, channel quality information of every 10ms feedback.Different channel quality informations can corresponding different feedback cycle and skews.Perhaps, preestablish one group of channel quality information corresponding identical feedback cycle and skew, the base station only needs to send to UE the feedback cycle and the skew of a channel quality information, and UE just knows feedback cycle and the skew corresponding with other channel quality information of one group of this channel quality information.
Channel quality information can also feed back to the base station with other uplink feedback information, uplink feedback information such as correct response/errored response (ACK/NACK), detection reference signal (SRS), dispatch request (SR) etc.If communication system is promptly supported the associating feedback, support feedback respectively again, then whether the base station indicates UE channel quality information can be fed back with other uplink feedback information by sending to UE to unite to feed back to identify, as unite the feedback be designated 0 the expression cannot feed back together, be 1 the expression can feed back together.
A plurality of UE are in a PRB during transmission of channel quality information, if communication system is only supported the frequency hopping transmission or only support non-frequency hopping transmission that then the base station can not need to send the frequency hopping sign to UE; If communication system is supported this dual mode, then the base station identifies to represent whether adopt frequency hopping by sending frequency hopping to UE.
If it is a plurality of that the demodulation pilot frequency frequency expansion sequence has, then for a plurality of demodulation pilot frequency frequency expansion sequences a plurality of different demodulation pilot frequency frequency expansion sequence call numbers are set in advance.Base station and terminal are all preserved the corresponding relation of demodulation pilot frequency frequency expansion sequence call number and demodulation pilot frequency frequency expansion sequence.The base station sends to UE with demodulation pilot frequency frequency expansion sequence call number, and UE just can carry out spread spectrum to frequency pilot sign according to the demodulation pilot frequency frequency expansion sequence of demodulation pilot frequency frequency expansion sequence call number correspondence, and with the demodulation pilot frequency mapping behind the spread spectrum to PRB.The spread spectrum of frequency pilot sign comprises frequency domain spread spectrum and time domain spread spectrum, referring to shown in Figure 8.Different demodulation pilot frequency frequency expansion sequences can be realized by the cyclic shift of a cyclically shifted sequences.If a demodulation pilot frequency takies a plurality of OFDMs (OFDM) symbol transmission, then can on the basis of frequency domain spread spectrum, carry out the time domain spread spectrum again.
Perhaps, the base station can not send demodulation pilot frequency frequency expansion sequence call number to UE yet, and UE can determine demodulation pilot frequency frequency expansion sequence call number by data orthogonal spreading sequence call number.In UE, preserve data orthogonal spreading sequence call number (r
Data) and demodulation pilot frequency frequency expansion sequence call number (r
RS) corresponding relation r
RS=f (r
Data, Δ), wherein Δ is a side-play amount, this parameter can be sub-district exclusive (Cell-specific), also can be UE exclusive (UE-specific), r
RSSpan be [0,12l-1], wherein l is the quantity of the sequence of the time domain orthogonal that demodulation pilot frequency can be used in the communication system, r
DataSpan be [0, k-1], wherein k is the quantity of data orthogonal spreading sequence available in the communication system, function f () satisfies mapping relations one by one, promptly by a r
DataCan only obtain a unique r with a Δ
RS
All information that the base station sends to UE in the present embodiment can be passed through high-level signaling (as the RRC signaling) transmission.A high-level signaling can carry one or more information.
Be used to realize that the software of the embodiment of the invention can be stored in storage mediums such as floppy disk, hard disk, CD and flash memory.
The base station sends different data orthogonal spreading sequence call numbers to different UE in the embodiment of the invention, the channel quality information that different UEs basis data orthogonal spreading sequence call number is separately obtained can transmit on same PRB, thereby improved the last transfer efficiency of channel quality information, saved Internet resources.The base station can also send PRB information, feedback format, feedback content, feedback cycle and skew to UE, unite information such as feedback sign, frequency hopping sign and demodulation pilot frequency frequency expansion sequence call number, to adapt to the needs of different situations in the embodiment of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1. the method for a transmission of channel quality information is characterized in that, may further comprise the steps:
The base station generates the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number;
The base station is to the instruction of user equipment (UE) transmitting channel quality feedback, and indication UE generates channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers, the channel quality information that a plurality of UE generate transmits in same Physical Resource Block.
2. the method for claim 1 is characterized in that, before UE feedback channel quality information, the base station is determined and sent in the following message one or multinomial to UE:
Feedback cycle and skew; Unite the feedback sign; The frequency hopping sign; Demodulation pilot frequency frequency expansion sequence call number;
Whether wherein, unite feedback sign is used to identify channel quality information and feeds back with uplink feedback information; The frequency hopping sign is used for sign and whether adopts frequency hopping mode feedback channel quality information.
3. method as claimed in claim 2 is characterized in that, uplink feedback information comprises correct response/errored response ACK/NACK, surveys with at least one among reference signal SRS and the dispatch request SR.
4. as claim 1,2 or 3 described methods, it is characterized in that when communication system was supported the data orthogonal spreading sequence of multiple length, the base station also needed to determine the orthogonal spreading sequence length that UE is adopted and send to UE.
5. method as claimed in claim 4, it is characterized in that, also comprise step: the base station generates in data orthogonal spreading sequence length, data orthogonal spreading sequence call number and the Physical Resource Block call number at least two according to combined coding mode or absolute coding mode in advance.
6. method as claimed in claim 5 is characterized in that, the base station is carried out absolute coding generating under the situation of data orthogonal spreading sequence length and Physical Resource Block call number according to the combined coding mode to different resource pools.
7. the method for claim 1, it is characterized in that, the data orthogonal spreading sequence call number that the base station sends to UE, also be used to indicate UE to determine demodulation pilot frequency frequency expansion sequence call number, and determine the demodulation pilot frequency frequency expansion sequence and carry out spread spectrum according to demodulation pilot frequency frequency expansion sequence call number according to data orthogonal spreading sequence call number.
8. a base station is characterized in that, comprising:
Control module is used to generate the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number;
Interface module, be used for instructing to user equipment (UE) transmitting channel quality feedback, indication UE generates channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers, the channel quality information that a plurality of UE generate transmits in same Physical Resource Block.
9. base station as claimed in claim 8 is characterized in that, control module also is used for generating one of following message or multinomial:
Feedback cycle and skew; Unite the feedback sign; The frequency hopping sign; Demodulation pilot frequency frequency expansion sequence call number;
Whether wherein, unite feedback sign expression channel quality information feeds back with uplink feedback information; Whether the expression of frequency hopping sign adopts frequency hopping mode feedback channel quality information;
Interface module also is used for sending one of following message or multinomial to UE:
Feedback cycle and skew; Unite the feedback sign; The frequency hopping sign; Demodulation pilot frequency frequency expansion sequence call number.
10. base station as claimed in claim 9 is characterized in that, uplink feedback information comprises that correct response storage mistake responds ACK/NACK, surveys with at least one among reference signal SRS and the dispatch request SR.
11., it is characterized in that when communication system was supported the data orthogonal spreading sequence of multiple length, control module also was used for the orthogonal spreading sequence length that definite UE is adopted as claim 8,9 or 10 described base stations; Interface module also is used for sending data orthogonal spreading sequence length to UE.
12. base station as claimed in claim 11, it is characterized in that, also comprise: generation module generates in data orthogonal spreading sequence length, data orthogonal spreading sequence call number and the Physical Resource Block call number at least two according to combined coding mode or absolute coding mode.
13. method as claimed in claim 12 is characterized in that, generation module carries out absolute coding generating under the situation of data orthogonal spreading sequence length and Physical Resource Block call number according to the combined coding mode to different resource pools.
14. base station as claimed in claim 8, it is characterized in that, interface module sends data orthogonal spreading sequence call number to UE, also be used to indicate UE to determine demodulation pilot frequency frequency expansion sequence call number, and determine the demodulation pilot frequency frequency expansion sequence and carry out spread spectrum according to demodulation pilot frequency frequency expansion sequence call number according to data orthogonal spreading sequence call number.
15. a communication system is characterized in that, comprising:
The base station is used to generate the channel-quality feedback instruction, and this channel-quality feedback instruction comprises feedback format, feedback content, data orthogonal spreading sequence call number and Physical Resource Block call number, and instructs to user equipment (UE) transmitting channel quality feedback; Wherein, send in the channel-quality feedback instruction of different UEs and carry different data orthogonal spreading sequence call numbers;
UE is used for generating channel quality information according to feedback content and data orthogonal spreading sequence call number, and feeds back on Physical Resource Block call number corresponding physical Resource Block according to feedback format; Wherein, the channel quality information of a plurality of UE generations transmits in same Physical Resource Block.
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| CN102036394B (en) | 2013-11-20 |
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