CN102447531B - Method and device for obtaining user CQI (Channel Quality Indicator) in HSDPA (High Speed Downlink Packet Access) system - Google Patents
Method and device for obtaining user CQI (Channel Quality Indicator) in HSDPA (High Speed Downlink Packet Access) system Download PDFInfo
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Abstract
The invention provides a method and a device for obtaining a user CQI (Channel Quality Indicator) in an HSDPA (High Speed Downlink Packet Access) system. The method comprises the following steps of: executing packet scheduling for a first user, and allocating an HS-PDSCH (High-Speed Physical Downlink Shared Channel) resource; judging whether residual HSDPA channels exist, and whether a second user which needs to execute CQI feedback, but to which the HS-PDSCH resource is not allocated, exists; if so, forming a virtual scheduling user list with the second users of which current sub-frames are not scheduled, and executing virtual scheduling to allocate the HS-PDSCH resource for the virtual scheduling users; recording the users which get success in virtual scheduling, and generating HS-SCCH (High Speed-Shared Control Channel) information for the users which get success in virtual scheduling; and receiving the HS-SICH (High Speed Dedicated Physical Control Channel) information fed back by the users which get success in virtual scheduling, obtaining the CQI by measuring in the HS-SICH information. The method and the device provided by the invention can help a base station to obtain more accurate CQIs of users.
Description
Technical field
The present invention relates to TD-SCDMA system, relate in particular to a kind of method and a kind of device that obtains user CQI in HSDPA system that obtains user CQI in HSDPA system.
Background technology
In TD-SCDMA system, in order to improve downlink transmission data rate, meet growing data service requirement, 3GPP has introduced HSDPA (High Speed Downlink Packet Access, high speed downlink packet access) technology in Release 5 standards.HSDPA comprises the multinomial key technologies such as AMC (Adaptive Modulation and Coding) and fast dispatch, and wherein, AMC determines code rate and modulation system according to user's channel condition, improves the throughput of system under the prerequisite that guarantees Block Error Rate; And fast dispatch technology is not only considered user's channel condition, also take into account the fairness between different user simultaneously, to obtain time diversity gain and multi-user diversity gain.In HSDPA, the user's that above-mentioned two technology are used channel condition is exactly that base station obtains by the CQI (Channel Quality Indicator, channel quality indication) of user feedback.If base station can obtain the CQI of user feedback in time, just can make correct decision-making.Visible, obtain in time CQI very large on the impact of systematic function.
User receives HS-PDSCH (High-Speed Physical Downlink Shared Channel, high-speed physical downlink shared channel (HS-PDSCH)) time measure the SIR (signal-to-jamming ratio) of HS-PDSCH, and table look-up and determine the CQI of feedback according to the current user's of distributing to BRU (basic resource unit) number of resources.Due to the feedback of CQI be distribute to user BRU number as a reference, therefore, even if subscriber channel situation is fine, SIR is more satisfactory, can use good modulation coding mode, if but base station assigns is little to user's BRU resource, the RTBS (recommending transmission block size) in the CQI of feedback also can be very little.Such as, the user who is 6 for physical layer classification, the measurement result of the SIR of HS-PDSCH is very desirable, can support that 16QAM and code rate are 1 modulation coding mode, each BRU can carry the useful data of 176bit, but be 32 and 8 situation for the BRU that distributes to user, the size corresponding to RTBS of feedback is respectively 5600 (sequence number is 63) and 1350 (sequence number is 35).
In addition, the HS-PDSCH BRU resource of distribution is fewer, and the discrimination of CQI is just lower.Still describing with example above, is 32 and 8 situation for the BRU that distributes to user, and the optional scope of the RTBS of feedback is respectively 0 to 63 and 0 to 35.Optional scope is little, and the discrimination of CQI has also just reduced, and CQI accuracy is just weakened.
Visible, the CQI of user feedback is subject to following restriction:
(1) the HS-PDSCH resource of the measurement of SIR based on distributed;
(2) how many HS-PDSCH BRU resources that the CQI size of feedback is distributed affects.
Complete scheduling for more effective, base station need to obtain user's the CQI the most accurately that can reflect current channel in time.But based on as above restriction, base station is difficult to obtain in time user's CQI feedback, especially in the time that the HSDPA user of base station service is more.Someone proposes one and utilizes P-CCPCH (Primary Common Control Physical Channel, Primary Common Control Physical Channel) channel quality replaces the method for CQI, but because P-CCPCH is likely different from the disturbed condition of HS-PDSCH channel, therefore the method can not solve the problem of above-mentioned existence completely.In addition someone to propose by each subframe be the certain a small amount of HS-PDSCH channel resource of user assignment that carries out CQI feedback, but the CQI accuracy obtaining is like this limited.
Therefore, how to obtain timely user more accurately CQI become current problem demanding prompt solution.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of method and device that obtains user CQI in HSDPA system, can obtain timely user CQI more accurately.
A method of obtaining user CQI in HSDPA system, comprises the following steps:
First user is carried out to packet scheduling, for first user distributes HS-PDSCH resource;
For first user distributes after HS-PDSCH resource, judge whether to exist remaining HSDPA channel, and existence need be carried out CQI feedback but the second user of unallocated HS-PDSCH resource;
If have remaining HSDPA channel and have the second user, the second user who current subframe is not scheduled forms virtual scheduling user list, and carries out virtual scheduling according to this virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource;
Record the successful user of virtual scheduling, and the successful user of this virtual scheduling is generated to HS-SCCH information;
Receive the HS-SICH information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards;
Obtain the CQI measuring in described HS-SICH information.
A device that obtains user CQI in HSDPA system, comprising:
Packet scheduling distribution module for first user is carried out to packet scheduling, and is first user distribution HS-PDSCH resource;
Judge module, is used to first user to distribute after HS-PDSCH resource, judge whether to exist remaining HSDPA channel, and existence need be carried out CQI feedback but the second user of unallocated HS-PDSCH resource;
User list creation module, if for having remaining HSDPA channel and having the second user, the second user who current subframe is not scheduled forms virtual scheduling user list;
Virtual scheduling distribution module, for carrying out virtual scheduling according to described virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource;
HS-SCCH information generating module, for recording the successful user of virtual scheduling, and generates HS-SCCH information to the successful user of this virtual scheduling;
HS-SICH information receiving module, for receiving the HS-SICH information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards;
CQI acquisition module, the CQI measuring for obtaining described HS-SICH information.
Can be found out by above scheme, method and the device that obtains user CQI in HSDPA system of the present invention, by but HS-PDSCH data channel corresponding to unactual transmission of user assignment HSDPA control channel for carrying out CQI feedback, allow to carry out CQI feedback and again the user of unallocated HS-PDSCH resource measure the users' of other true scheduling HS-PDSCH, thereby obtain user's CQI feedback.This CQI method of obtaining based on virtual scheduling can help base station to obtain in time user CQI more accurately, and do not need existing consensus standard to modify, only need to increase this flow process of virtual scheduling and just can obtain the raising of systematic function, in Project Realization and practical application, there is great meaning.
Accompanying drawing explanation
Fig. 1 is a kind of schematic flow sheet that obtains the method for user CQI in HSDPA system;
Fig. 2 is a kind of structural representation that obtains the device of user CQI in HSDPA system.
Embodiment
The invention provides a kind of method and device that obtains user CQI in HSDPA system, can solve in prior art and cannot obtain timely user's problem of CQI accurately.Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of method of obtaining user CQI in HSDPA system, comprises the following steps:
Step S1, base station is carried out packet scheduling according to normal consistency flow process to first user, for first user distributes HS-PDSCH resource.
Step S2, for first user distributes after HS-PDSCH resource, judges whether to exist remaining HSDPA channel, and exists and need carry out CQI feedback but the second user of unallocated HS-PDSCH resource, if so, performs step S3; Otherwise, finishing this subframe scheduling, flow process finishes.
Step S3, if there is remaining HSDPA channel and have the second user, the second user who current subframe is not scheduled forms virtual scheduling user list, then carries out virtual scheduling according to described virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource.
As a good embodiment, after described the second user that current subframe is not scheduled forms virtual scheduling user list, for before the virtual scheduling user in this virtual scheduling user list carries out the distribution of HS-PDSCH resource, can also comprise step S301: the subframe that the second user in described virtual scheduling user list was scheduled according to the last time and the number of sub frames of current sub-frame interval are carried out descending.
In addition, describedly carry out virtual scheduling according to virtual scheduling user list, for the process of virtual scheduling user assignment HS-PDSCH resource is specifically as follows: carry out virtual scheduling according to described virtual scheduling user list, be followed successively by virtual scheduling user assignment HS-PDSCH resource by the order of descending, until HSDPA channel is all finished.Optionally, the second user that current subframe is not scheduled forms after virtual scheduling user list, also can carry out according to the order of sequence virtual scheduling by the order of other arrangements according to described virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource.Wherein, the HS-PDSCH resource of distribution is to distribute to maximum HS-PDSCH resource of this user according to user capability, and does not consider whether reality has been distributed to other normal consistencies or virtual scheduling user to this HS-PDSCH resource.When virtual scheduling, if user does not have available HARQ process, abandon this user to carry out virtual scheduling.
Step S4, record the successful user of virtual scheduling, and the successful user of this virtual scheduling is generated to HS-SCCH (High Speed-shared control Channel, High-Speed Shared Control Channel) information, then by HS-SCCH channel, described HS-SCCH information is sent to user.
Preferably, described HS-SCCH information comprises transport block size information, and in HS-SCCH information of the present invention, transmission block size is 0.
In addition, in described HS-SCCH information, except comprising transport block size information, also comprise: the information such as the HS-PDSCH resource of distribution, modulation system, HARQ process number, redundancy versions, new data indication.Specific as follows:
For the successful user of virtual scheduling, the HS-PDSCH resource of on HS-SCCH, indication being distributed;
For the successful user of virtual scheduling, on HS-SCCH, by indicating modulation mode, can be QPSK;
For the successful user of virtual scheduling, on HS-SCCH, will indicate HARQ process number, get the sequence number of this user's available HARQ process;
For the successful user of virtual scheduling, on HS-SCCH, will indicate redundancy versions, any value all can;
For the successful user of virtual scheduling, on HS-SCCH, indication new data is designated as to new data;
For the successful user of virtual scheduling, what the MAC-hs of base station can't be real has data to send to physical layer to carry out the actual physical layer process about HS-PDSCH, and just sends HS-SCCH information.
Step S5, receives HS-SICH (High-Speed Shared Information Channel, the high speed information shared channel) information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards.Because being, operating process above carries out at base station end, and at user side, the successful user of described virtual scheduling can be known according to described HS-SCCH information the HS-PDSCH resource of distribution, receiving actual is to issue other by the HS-PDSCH that user distributed of normal consistency, and the data on this channel are carried out to CRC (Cyclic Redundancy Check, cyclic redundancy check (CRC) code) verification, if correct reception generates ACK; Otherwise, generate NACK.Simultaneously, user also can carry out the measurement of CQI, generate CQI, inform that owing to issuing in virtual scheduling user's HS-SCCH information its transmission block size is 0 simultaneously, so in fact virtual scheduling user's physical layer does not have Packet Generation to MAC-hs, only have CRC check result (ACK information or nack message) and CQI, therefore, can not cause the mistake of data to receive.
It should be noted that, the successful user of virtual scheduling is the same with normal consistency user, all can send to base station HS-SICH information.
Step S6, obtains the CQI measuring in described HS-SICH information.
By said method, base station has just obtained normal consistency user and virtual scheduling user's CQI simultaneously, and the accuracy of measuring is the same with normal consistency.
As a good embodiment, the present invention can also comprise step S7, after obtaining the CQI measuring in HS-SICH information described in, can also comprise the steps: the information of the successful user feedback of virtual scheduling to process, discharge HARQ process corresponding to HARQ process number, and its state is changed into idle available.It should be noted that, no matter base station to the successful user feedback of virtual scheduling be ACK information or nack message, base station all discharges corresponding HARQ process, changes into idle available.
The present invention is transparent for user's side, user does not also know that oneself is by virtual scheduling or scheduling normally, and, during due to virtual scheduling, issuing and indicating the transmission block size of its reception in this user's HS-SCCH information is 0, so it can not have any impact to protocol layer more than MAC-hs.
Corresponding with a kind of method of obtaining user CQI in HSDPA system of the present invention, the present invention also provides a kind of device that obtains user CQI in HSDPA system, as shown in Figure 2, comprising:
Packet scheduling distribution module for first user is carried out to packet scheduling, and is first user distribution HS-PDSCH resource;
Judge module, is used to first user to distribute after HS-PDSCH resource, judge whether to exist remaining HSDPA channel, and existence need be carried out CQI feedback but the second user of unallocated HS-PDSCH resource;
User list creation module, if for having remaining HSDPA channel and having the second user, the second user who current subframe is not scheduled forms virtual scheduling user list;
Virtual scheduling distribution module, for carrying out virtual scheduling according to described virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource;
HS-SCCH information generating module, for recording the successful user of virtual scheduling, and generates HS-SCCH information to the successful user of this virtual scheduling;
HS-SICH information receiving module, for receiving the HS-SICH information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards.That is: the successful user of virtual scheduling is known the HS-PDSCH resource of distribution according to described HS-SCCH information, carry out the measurement of CQI, then send HS-SICH information to base station, described HS-SICH information receiving module receives this HS-SICH information that user sends.
CQI acquisition module, the CQI measuring for obtaining described HS-SICH information.
Preferably, described HS-SCCH information comprises transport block size information, and in HS-SCCH information of the present invention, transmission block size is 0.
In addition, in described HS-SCCH information, except comprising transport block size information, also comprise: the information such as the HS-PDSCH resource of distribution, modulation system, HARQ process number, redundancy versions, new data indication.And described modulation system can be QPSK, and described redundancy versions can be got any value, and described new data is designated as new data.
Preferably, device of the present invention can also comprise release process module, after receiving described HS-SICH information, the information of the successful user feedback of virtual scheduling is processed, discharge HARQ process corresponding to HARQ process number, and its state is changed into idle available.
Preferably, described user list creation module can comprise that list arranges module, carries out descending for subframe that the second user of described virtual scheduling user list was scheduled according to the last time and the number of sub frames of current sub-frame interval.
Preferably, described virtual scheduling distribution module can comprise virtual scheduling submodule, for carrying out virtual scheduling according to described virtual scheduling user list, be followed successively by virtual scheduling user assignment HS-PDSCH resource by the order of descending, until HSDPA channel is all finished.
Other technologies feature in a kind of device that obtains user CQI in HSDPA system of the present invention and a kind of above-mentioned method of obtaining user CQI in HSDPA system are similar, do not repeat them here.
Can find out by above scheme, method and the device that obtains user CQI in HSDPA system of the present invention, by but HS-PDSCH data channel corresponding to unactual transmission of user assignment HSDPA control channel for carrying out CQI feedback, allow to carry out CQI feedback and again the user of unallocated HS-PDSCH resource measure the users' of other true scheduling HS-PDSCH, thereby obtain user's CQI feedback.This CQI method of obtaining based on virtual scheduling can help base station to obtain in time user CQI more accurately, and do not need existing consensus standard to modify, only need to increase this flow process of virtual scheduling and just can obtain the raising of systematic function, in Project Realization and practical application, there is great meaning.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (8)
1. a method of obtaining user CQI in HSDPA system, is characterized in that, comprises the following steps:
First user is carried out to packet scheduling, for first user distributes HS-PDSCH resource;
For first user distributes after HS-PDSCH resource, judge whether to exist remaining HSDPA channel, and existence need be carried out CQI feedback but the second user of unallocated HS-PDSCH resource;
If have remaining HSDPA channel and have the second user, the second user who current subframe is not scheduled forms virtual scheduling user list, and carries out virtual scheduling according to this virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource;
Record the successful user of virtual scheduling, and the successful user of this virtual scheduling is generated to HS-SCCH information; Described HS-SCCH information comprises transport block size information, and described transmission block size is 0;
Receive the HS-SICH information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards;
Obtain the CQI measuring in described HS-SICH information.
2. the method for obtaining user CQI in HSDPA system according to claim 1, is characterized in that, in described HS-SCCH information, also comprises: the HS-PDSCH resource of distribution, modulation system, HARQ process number, redundancy versions, new data indication.
3. the method for obtaining user CQI in HSDPA system according to claim 2, is characterized in that, described modulation system is QPSK;
And/or
Described new data is designated as new data.
4. the method for obtaining user CQI in HSDPA system according to claim 1, it is characterized in that, after described the second user that current subframe is not scheduled forms virtual scheduling user list, for before the virtual scheduling user in this virtual scheduling user list carries out the distribution of HS-PDSCH resource, also comprise step: the subframe that the second user in described virtual scheduling user list was scheduled according to the last time and the number of sub frames of current sub-frame interval are carried out descending.
5. the method for obtaining user CQI in HSDPA system according to claim 4, it is characterized in that, after the CQI measuring in the described HS-SICH of obtaining information, also comprise step: the information to the successful user feedback of virtual scheduling is processed, discharge HARQ process corresponding to HARQ process number, and its state is changed into idle available;
And/or
Describedly carry out virtual scheduling, specifically comprise for the process of virtual scheduling user assignment HS-PDSCH resource according to virtual scheduling user list: carry out virtual scheduling according to described virtual scheduling user list, be followed successively by virtual scheduling user assignment HS-PDSCH resource by the order of descending, until HSDPA channel is all finished.
6. a device that obtains user CQI in HSDPA system, is characterized in that, comprising:
Packet scheduling distribution module for first user is carried out to packet scheduling, and is first user distribution HS-PDSCH resource;
Judge module, is used to first user to distribute after HS-PDSCH resource, judge whether to exist remaining HSDPA channel, and existence need be carried out CQI feedback but the second user of unallocated HS-PDSCH resource;
User list creation module, if for having remaining HSDPA channel and having the second user, the second user who current subframe is not scheduled forms virtual scheduling user list;
Virtual scheduling distribution module, for carrying out virtual scheduling according to described virtual scheduling user list, is virtual scheduling user assignment HS-PDSCH resource;
HS-SCCH information generating module, for recording the successful user of virtual scheduling, and generates HS-SCCH information to the successful user of this virtual scheduling; Described HS-SCCH information comprises transport block size information, and described transmission block size is 0;
HS-SICH information receiving module, for receiving the HS-SICH information of the successful user feedback of described virtual scheduling; Wherein said HS-SICH information is that the measurement of knowing the HS-PDSCH resource of distribution by the successful user of described virtual scheduling according to described HS-SCCH information and carrying out CQI produces afterwards;
CQI acquisition module, the CQI measuring for obtaining described HS-SICH information.
7. the device that obtains user CQI in HSDPA system according to claim 6, is characterized in that, in described HS-SCCH information, also comprises: the HS-PDSCH resource of distribution, modulation system, HARQ process number, redundancy versions, new data indication.
8. the device that obtains user CQI in HSDPA system according to claim 6, it is characterized in that, also comprise release process module, after being used for receiving described HS-SICH information, information to the successful user feedback of virtual scheduling is processed, discharge HARQ process corresponding to HARQ process number, and its state is changed into idle available;
And/or
Described user list creation module comprises that list arranges module, carries out descending for subframe that the second user of described virtual scheduling user list was scheduled according to the last time and the number of sub frames of current sub-frame interval.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2037614A2 (en) * | 2002-04-06 | 2009-03-18 | LG Electronics, Inc. | Radio link parameter updating or processing method in mobile communication system |
| CN101753274A (en) * | 2008-12-19 | 2010-06-23 | 中国移动通信集团设计院有限公司 | Resource scheduling method, system and equipment in time division duplex high speed downlink packet access (TDD HSDPA) system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2037614A2 (en) * | 2002-04-06 | 2009-03-18 | LG Electronics, Inc. | Radio link parameter updating or processing method in mobile communication system |
| CN101753274A (en) * | 2008-12-19 | 2010-06-23 | 中国移动通信集团设计院有限公司 | Resource scheduling method, system and equipment in time division duplex high speed downlink packet access (TDD HSDPA) system |
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