CN101527612B - Method for reporting channel reference information - Google Patents
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- CN101527612B CN101527612B CN2008101012871A CN200810101287A CN101527612B CN 101527612 B CN101527612 B CN 101527612B CN 2008101012871 A CN2008101012871 A CN 2008101012871A CN 200810101287 A CN200810101287 A CN 200810101287A CN 101527612 B CN101527612 B CN 101527612B
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Abstract
The invention discloses a method for reporting channel reference information, which comprises the following steps of: preselecting a multi-address sequence which does not share the same code word space with an OVSF address code and has a length which is greater than a common OVSF code and can be preset; and when a user terminal is in an unscheduled state, reporting the channel reference information to a network side by using a distributed multi-address sequence. The method realizes the report of the channel reference information before the distribution of HS-SCCH, thereby improving the efficiency of service scheduling.
Description
Technical field
The present invention relates to channel quality maintenance technology, particularly a kind of channel reference information report method.
Background technology
In radio communication service, the channel conditions between user and base station be need grasp at any time, thereby code modulation mode and power etc. adjusted in real time, effectively utilizing system resource, and high quality services is provided for the user.
In being applicable to the HSDPA technology of high speed packet service; (16QAM 64QAM) waits technology, and realizes fast dispatch in base station side through adopting AMC, HARQ and high order modulation; Thereby variation that can fast automatic adaptive channel obtains higher user's peak rate and cell data throughput.
Particularly, HS-SICH and HS-SCCH that network side is right for the user is distributed into, wherein, HS-SICH just begins transmission information after a period of time that HS-SCCH begins.The user utilizes the information of HS-SICH feedback channel quality information (CQI) and downlink data ACK/NACK, and current channel conditions is confirmed according to the CQI that HS-SICH carries in the base station, thereby carries out AMC and HARQ process.It is thus clear that the accuracy of CQI and promptness have been brought into play important function in AMC and HARQ process.
But; At present in the TDD cdma system, owing to HS-SCCH begins before HS-SICH, therefore; In the several transmission time intervals of beginning (TTI) that HS-SCCH sends, can't obtain up-to-date CQI information; Therefore send continuously under the scene (for example FTP transmits the firm incipient stage) of beginning in major part, the scheduler of network side can only carry out blind scheduling, thereby can't make full use of system resource.And under sudden very strong business scenario (for example browsing page), the data throughput performance of blind scheduling worsens more serious.
In addition; In the ordinary packet business, the user uplink power adjustment of carrying out through close-loop power controlling method usually can more reasonably utilize system resource to carry out transfer of data; And closed power control also depends on the reporting of user channel reference information, thereby keeps link-quality.
Summary of the invention
In view of this, the present invention provides a kind of reporting channel reference information, can before unallocated HS-SCCH, realize reporting of channel reference information, thereby improves the efficient of service dispatching.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of reporting channel reference information comprises:
Allocate length in advance greater than 16 and do not share the multiple access sequence of same code word space with the OVSF address code;
When user terminal is in the state that is not scheduled, utilize the multiple access sequence of distributing to network side reporting channel reference information.
Preferably; Said utilize multiple access sequence reporting channel reference information before; This method further comprises: after getting into the connection of pointing to the exchanges data territory when said user terminal, radio network controller (RNC) is handed down to said user terminal with the transmission parameter of multiple access sequence.
Preferably, the transmission parameter of said multiple access sequence comprises initial time slot position indication, duration length, repeat length and the time migration of transmission.
Preferably, the duration length of said multiple access sequence is the integral multiple of a sub-frame.
Preferably, said multiple access sequence is produced by the sequence structure that m pseudo random sequence or other their cross correlations meet the demands.
Preferably, the length of said multiple access sequence and ascending time slot equal in length.
Preferably, for different channel reference informations corresponding burst structure is set in advance;
The multiple access sequence that said utilization is selected comprises to network side reporting channel reference information: the pairing burst structure of channel reference information type according to said user terminal is organized said channel reference information, and utilizes the channel reference information behind the said multiple access sequence modulation tissue and report network side.
Preferably, said channel reference information is channel quality information CQI or visits logical sounding signal; Said CQI is: absolute CQI value, perhaps, the changing value of CQI value and change direction.
Preferably; Said channel reference information is the CQI of said user terminal; Corresponding burst structure is: the lead code that is used for channel estimating and the CQI symbol that is used to represent CQI information and lead code, CQI symbol all are continuous; Perhaps, the time-domain of lead code and discrete CQI symbol and this structure and intermediate code Midamble area coincidence is idle.
Preferably, confirm said preamble length and maximum number according to the target interference threshold in advance, confirm said CQI symbol lengths according to the length of said multiple access sequence.
Preferably, said channel reference information is said sounding signal, and corresponding burst structure is: continuous sounding signal, perhaps, the time-domain of discrete sounding signal and this structure and Midamble area coincidence is idle.
Preferably, confirm the duty ratio of sounding signal in advance.
Visible by technique scheme, among the present invention, allocate length in advance greater than 16 and do not share the multiple access sequence of same code word space with the OVSF address code,, this multiple access sequence can be by the m pseudo random sequence preferred or other their cross correlations preferably sequence structure produce.When user terminal is in the state that is not scheduled, utilize the long multiple access sequence of distributing to network side reporting channel reference information.Like this; Though do not distribute the HS-SICH channel, utilize the multiple access sequence of another code word space can realize reporting of channel reference information, thereby improve the professional service feature of incipient stage just; And through the control of multiple access sequence length, antagonism upgoing O VSF sign indicating number disturbs.
Description of drawings
Fig. 1 is the overview flow chart of channel reference information report method provided by the invention.
Fig. 2 is the particular flow sheet of channel reference information report method in the embodiment of the invention one.
Fig. 3 is the sketch map of first kind of CQI burst structure in the embodiment of the invention one.
Fig. 4 is the sketch map of second kind of CQI burst structure in the embodiment of the invention one.
The sketch map that Fig. 5 utilizes the multiple access sequence to modulate when being configured to 2:4 for uplink and downlink timeslot in the embodiment of the invention one.
The sketch map that Fig. 6 utilizes the multiple access sequence to modulate when being configured to 3:3 for uplink and downlink timeslot in the embodiment of the invention one.
Fig. 7 utilizes a plurality of subframes to report the sketch map of CQI information in the embodiment of the invention one.
Fig. 8 is the particular flow sheet of channel reference information report method in the embodiment of the invention two.
Fig. 9 is the sketch map of first kind of sounding signal burst structure in the embodiment of the invention two.
Figure 10 is the sketch map of second kind of sounding signal burst structure in the embodiment of the invention one.
Embodiment
For making the object of the invention, technological means and advantage clearer, the present invention is explained further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: when the user is in the state that is not scheduled, utilize the multiple access sequence reporting channel reference information of other code word space.
Fig. 1 is the overview flow chart of channel reference information report method provided by the invention.As shown in Figure 1, this method comprises:
Wherein, channel reference information can be the CQI information in the HSDPA business, thereby can channel conditions such as large scale decline be informed network side, perhaps also can be the known signal that is used to keep channel quality, for example sounding signal etc.
When utilizing multiple access sequence reporting channel reference information; Can be according to channel reference information dissimilar, corresponding burst structure is set in advance, behind the burst structure tissue of the channel reference information that will report then according to correspondence; Utilize the multiple access sequence to carry out spread spectrum, report network side then.
So far, overall procedure of the present invention finishes.
Below be example with visiting logical (sounding) signal just to report CQI information, the practical implementation process that channel reference information reports among the present invention is described.
Embodiment one:
In the present embodiment, be in when not being scheduled state, still realize reporting of CQI information the user.Fig. 2 is the particular flow sheet of channel reference information report method in the embodiment of the invention one.As shown in Figure 2, this method comprises:
In this step, distribute the long multiple access sequence of a code length to report CQI information.The code word space of this multiple access sequence is different with the OVSF address code; And the length of this multiple access sequence is wanted long enough; Thereby, make based on the user data signal of ovsf code structure less to interference according to the ascending physical signal signal of this multiple access sequence structure by means of bigger spreading gain.Wherein, this multiple access sequence can be various existing multiple access sequences, m pseudo random sequence etc. for example, and their cross correlation requires as long as satisfy preferably.
User terminal gets into connection (also can be described as a HSPA state) back very first time of pointing to the exchanges data territory; RNC must notify this user terminal about the specific physical characteristic of multiple access sequence, comprises initial time slot position indication, time span, repeat length and time migration etc.
After user terminal is in the state of not being scheduled and confirms CQI information according to common pilot signal, carry out following steps and carry out CQI and report:
In the present embodiment, for user terminal provides two kinds of CQI burst structure, first kind of CQI burst structure is as shown in Figure 3, comprises lead code (Preamble) and CQI symbol, and lead code and CQI symbol next-door neighbour and continuous.Wherein, Preamble is used to carry out channel estimating, and the CQI symbol is used to represent CQI information.The preamble length and the parameters such as CQI symbol lengths, number that comprise in concrete this structure can be set according to actual state, among Fig. 3 with two CQI symbols of each user terminal as an example.
Second kind of CQI burst structure is as shown in Figure 4; Comprise lead code and CQI symbol, wherein, lead code and CQI symbol are not continuous yet; In this structure, be idle, promptly among Fig. 4 shown in IP (Idle Period) part with the time-domain of intermediate code Midamble area coincidence.Similar with first kind of CQI burst structure, parameters such as the preamble length that comprises in the concrete structure and CQI symbol lengths, number can be set according to actual state.For example, can confirm preamble length according to the target interference threshold.
In above-mentioned two kinds of CQI burst structure; First kind of burst structure utilizes limited chip to carry more CQI information; The CQI that guarantees this user terminal reports efficient; But owing on time-domain, with the part of Midamble area coincidence the signal transmission is arranged still, therefore the Midamble signal to other users causes interference; Second kind of burst structure on time-domain with the part of Midamble area coincidence transmission signals not, can not cause interference, but report efficient yet with regard to the CQI that has lost this user terminal to other users' Midamble signal.In practical application, can adopt different burst structure to organize CQI information according to different needs.
Specifically when organizing CQI information, Preamble is inserted in the selected burst structure with the back CQI symbol that forms of CQI information modulation that this user terminal will report.Wherein, the CQI information that reports can be CQI information of the prior art, also can be that relative CQI changes, and comprises change direction (CQI rising/decline) and variable quantity.In addition, the present embodiment requirement utilizes bigger spreading factor, and spreading factor is big more, and the CQI symbol numbers is just more little, and therefore in order to dwindle the scope of possibility, the present invention advises that CQI information adopts the form of CQI variation to represent.
In this step, when carrying out band spectrum modulation, preferably, the sequence after band spectrum modulation utilizes whole ascending time slot to transmit.That is to say, carry out band spectrum modulation according to uplink and downlink timeslot ratio setting in the system.As shown in Figure 5, when uplink and downlink timeslot is configured to 2:4, take two sequences behind the slot transmission spread spectrum; As shown in Figure 6, when uplink and downlink timeslot is configured to 3:3, take three sequences behind the slot transmission spread spectrum.
So far, the channel reference information report method flow process that provides in the present embodiment finishes.
In above-mentioned flow process; Utilize a sub-frame to transmit the CQI information of a user terminal, in fact, for further optimizing transmitting power; The CQI information of a user terminal (being the sequence behind the spread spectrum) can further extend to a plurality of subframes and transmit, for example 10ms (as shown in Figure 7) or 20ms.
In addition, the scene that the HSDPA technology is applied to there is a large number of users requested service usually and adopts the control scheduling mode, but under these scenes, since the restriction of bandwidth of air-interface, the compelled state of not being scheduled that is in of the user of a lot of requested services.Therefore in order to let these users obtain better business experience, need to consider to guarantee that sufficient CQI reports bandwidth.Wherein, the number of users scale can come further to increase through time-multiplexed mode.That is to say, when utilizing said method to report CQI information, can the CQI information of a plurality of reporting of user adopted time division way carry out multiplexing.But then; When a plurality of users report CQI information with time division multiplexing mode; Can produce interference mutually, therefore disturb for suppressing, the number of lead code (the multiple access sequence number that promptly transmits simultaneously) can more concentrate on a more moderate scale; Confirm according to the target interference threshold, such as 4 of each subframes.
Through said method, make to be in when not being scheduled state the user, still can utilize long multiple access sequence to report CQI information, thereby guarantee the professional service feature of incipient stage just.
In said process, user terminal such as beacon channel, is confirmed the CQI value through common pilot signal.Though the CQI value according to common pilot signal is confirmed is compared with the CQI value of obtaining according to dedicated pilot signal, and is careful inadequately, only be used to describe the variable of some large scale declines; Such as path loss; But more existing blind scheduling mode can improve service feature greatly, improves the performance of AMC.
Embodiment two:
In the present embodiment, be in when not being scheduled state, report the sounding signal, to keep user channel quality the user.Fig. 8 is the particular flow sheet of channel reference information report method in the embodiment of the invention two.As shown in Figure 8, this method comprises:
Step 801～802 are allocated length in advance greater than 16 and do not share the multiple access sequence of same code word space with the OVSF address code; Get into the connection in sensing exchanges data territory when user terminal after, radio network controller (RNC) is handed down to user terminal with the transmission parameter of multiple access sequence.
The selection of wherein concrete multiple access sequence and transmission parameter issue with embodiment one in identical, just repeat no more here.
Be in when not being scheduled state at user terminal, carry out following steps and carry out reporting of sounding signal:
Step 803 is organized the sounding signal according to the corresponding burst structure of sounding signal.
In the present embodiment, for the sounding signal provides two kinds of burst structure, first kind of structure is as shown in Figure 9, is continuous sounding signal; Second kind of structure is shown in figure 10, is discrete sounding signal, and the time-domain with the Midamble area coincidence in this structure is idle (shown in IP section among Figure 10).In Fig. 9 and Figure 10, be example with the sounding signal of 100% duty ratio, in fact, also can adopt the sounding signal of other duty ratios, be configured in user terminal through network side broadcasting or manual mode in advance and get final product.
The difference of above-mentioned two kinds of burst structure is identical with the difference of two kinds of burst structure among the embodiment one, just repeats no more here.
Step 804 is utilized the multiple access sequence of distributing in the step 801, and the sounding signal that step 803 is organized carries out band spectrum modulation, and reports network side.
In this step, carry out band spectrum modulation mode can with embodiment one in identical, just repeat no more here.
So far, the channel reference information report method flow process that provides in the present embodiment finishes.
In above-mentioned flow process; Utilize a sub-frame to transmit the CQI information of a user terminal, in fact, for further optimizing transmitting power; The CQI information of a user terminal (being the sequence behind the spread spectrum) can further extend to a plurality of subframes and transmit, for example 10ms or 20ms.
Embodiment by the invention described above is visible; Through the present invention; The base station can obtain each and be in the up-to-date dissemination channel condition of connected state (comprise the state of being scheduled and be not scheduled attitude alive) terminal equipment, and nationality keeps the quality of link in this controlling mechanism through forward direction.Therefore, no matter when transfer of data is recovered, up or descending, base station and terminal equipment can both the rapid adjustment emission characteristics satisfying the desired quality requirement, and this measure finally will realize higher system and customer service throughput.
In addition because the big spreading gain of long spreading factor, network can be with the interference-limited of self data portion in certain scope, thereby makes the decoding performance of normal data division not have deterioration clearly.At the efficient this respect, these newly-designed long multiple access insert signal and do not share same code word space with the OVSF address.So than the CQI report method based on ovsf code, this method can farthest reduce because therefore the overhead that needs transmission sounding signal or CQI to report can hold more HSPA state user.
More than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a reporting channel reference information is characterized in that, this method comprises:
Allocate length in advance greater than 16 and do not share the multiple access sequence of same code word space with Orthogonal Variable Spreading Factor OVSF OVSF address code;
Get into the connection in sensing exchanges data territory when user terminal after, radio network controller (RNC) is handed down to said user terminal with the transmission parameter of multiple access sequence;
When user terminal is in the state that is not scheduled, utilize the multiple access sequence of distributing to network side reporting channel reference information.
2. method according to claim 1 is characterized in that, the transmission parameter of said multiple access sequence comprises initial time slot position indication, duration length, repeat length and the time migration of transmission.
3. method according to claim 2 is characterized in that, the duration length of said multiple access sequence is the integral multiple of a sub-frame.
4. method according to claim 1 is characterized in that, said multiple access sequence is produced by the sequence structure that m pseudo random sequence or other their cross correlations meet the demands.
5. method according to claim 1 is characterized in that, the length of said multiple access sequence and ascending time slot equal in length.
6. method according to claim 1 is characterized in that, for different channel reference informations corresponding burst structure is set in advance;
The multiple access sequence that said utilization distributes comprises to network side reporting channel reference information: the pairing burst structure of channel reference information type according to said user terminal is organized said channel reference information, and utilizes the channel reference information behind the said multiple access sequence modulation tissue and report network side.
7. method according to claim 6 is characterized in that, said channel reference information is channel quality information CQI or visits logical sounding signal; Said CQI is: absolute CQI value, perhaps, the changing value of CQI value and change direction.
8. method according to claim 7; It is characterized in that; Said channel reference information is the CQI of said user terminal; Corresponding burst structure is: the lead code that is used for channel estimating and the CQI symbol that is used to represent CQI information and lead code, CQI symbol all are continuous, and perhaps, the time-domain of lead code and discrete CQI symbol and this structure and intermediate code Midamble area coincidence is the free time.
9. method according to claim 8 is characterized in that, confirms said preamble length and maximum number according to the target interference threshold in advance, confirms said CQI symbol lengths according to the length of said multiple access sequence.
10. method according to claim 7; It is characterized in that said channel reference information is said sounding signal, corresponding burst structure is: continuous sounding signal; Perhaps, the time-domain of discrete sounding signal and this structure and Midamble area coincidence is idle.
11. method according to claim 10 is characterized in that, confirms the duty ratio of sounding signal in advance.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1805426A (en) * | 2005-01-14 | 2006-07-19 | 华为技术有限公司 | Method of correcting channel quality indication in high-speed downlink grouped data packet access |
| WO2007050908A1 (en) * | 2005-10-27 | 2007-05-03 | Qualcomm Incorporated | A method and apparatus for reporting cqi in a wireless communication system |
| CN101001166A (en) * | 2006-01-11 | 2007-07-18 | 北京三星通信技术研究有限公司 | Frequency domain differential CQI report method and equipment of dynamic configuring maximum differential valve |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1805426A (en) * | 2005-01-14 | 2006-07-19 | 华为技术有限公司 | Method of correcting channel quality indication in high-speed downlink grouped data packet access |
| WO2007050908A1 (en) * | 2005-10-27 | 2007-05-03 | Qualcomm Incorporated | A method and apparatus for reporting cqi in a wireless communication system |
| CN101001166A (en) * | 2006-01-11 | 2007-07-18 | 北京三星通信技术研究有限公司 | Frequency domain differential CQI report method and equipment of dynamic configuring maximum differential valve |
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