WO2009022970A1 - Method and arrangement for feeding back cqi values in a telecommunication system - Google Patents

Method and arrangement for feeding back cqi values in a telecommunication system Download PDF

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Publication number
WO2009022970A1
WO2009022970A1 PCT/SE2008/050824 SE2008050824W WO2009022970A1 WO 2009022970 A1 WO2009022970 A1 WO 2009022970A1 SE 2008050824 W SE2008050824 W SE 2008050824W WO 2009022970 A1 WO2009022970 A1 WO 2009022970A1
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Prior art keywords
cqi
base station
reports
resource blocks
values
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Application number
PCT/SE2008/050824
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French (fr)
Inventor
Johan Bergman
George JÖNGREN
Kristina Jersenius
Eva Englund
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Telefonaktiebolaget L M Ericsson (Publ)
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Publication of WO2009022970A1 publication Critical patent/WO2009022970A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Definitions

  • the present invention relates to reporting of downlink channel quality information (CQI) .
  • CQI downlink channel quality information
  • a base station which in LTE is referred to as an eNodeB, communicating with a User Equipment, UE, transmits reference signals to UE.
  • the reference signals can be used by UE to determine the present downlink channel quality.
  • UE 101 After having determined the downlink channel quality on the basis of the received reference signals, UE 101 sends one or more channel state feedback reports, which in this context typically are referred to as Channel Quality Indication (CQI) reports, back to eNodeB.
  • CQI Channel Quality Indication
  • the content of the one or more CQI reports can be retrieved and used by a scheduler.
  • the UEs need to provide eNodeB with detailed downlink channel quality information (CQI) .
  • CQI channel quality information
  • the CQI report should contain one CQI report per resource block (RB) .
  • RB resource block
  • CQI information needs to be compressed somehow.
  • Many CQI compression schemes have been proposed in 3GPP.
  • One of the more straightforward CQI compression schemes that have been proposed is to do frequency domain averaging over several RBs and report the average values only.
  • CQIs are typically reported periodically by the UE so that eNodeB always has fairly recent channel quality information available when data is about to be scheduled in downlink by eNodeB to the UE.
  • One possibility for eNodeB is to also perform some time domain filtering in order to improve the accuracy of the frequency domain averaged CQI values.
  • One embodiment of the present invention relates to a method in a radio base station for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided by a UE, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) .
  • the method comprises the steps of
  • RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value
  • the receiving side is able to achieve improved frequency resolution by performing time domain filtering of subsequent CQI reports, the borders between the bins are varied in time instead of being fixed.
  • Frequency domain averaging is applied to the CQI values, meaning that one CQI value is reported for every bin of Nbin RBs rather than one CQI value for every RB.
  • the number of CQI values to report can be kept low while an improved frequency resolution can be achieved.
  • a further embodiment of the invention relates to a method in a User Equipment (UE) for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) .
  • the method is characterized by the steps of
  • a further embodiment of the invention relates to a radio base station capable of receiving reports of downlink channel quality information, CQI, from a UE, where each CQI report is constituted of frequency comain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) .
  • the radio base station comprises
  • a receiver unit capable of receiving CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value;
  • processing unit capable of performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
  • a further embodiment of the invention relates to a User Equipment, UE, capable of reporting downlink channel quality information, CQI, to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) .
  • the UE comprises - a processing unit capable of calculating said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value;
  • a transmitter capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks .
  • the offset value to be applied and the rules on when and how to apply the offset value may be a predefined fixed value, e.g. set by a standard.
  • the UE can be configured e.g. by higher layer signaling such as RRC or through MAC control. Such configuration may include a set of bin patterns indicating where the UE should measure and how to report CQI from this set in a certain order.
  • the offset value can be variable to adjust to e.g. radio channel characteristics, scheduling algorithm and the number of UEs to be scheduled simultaneously.
  • Figure 3 illustrates an example similar to the example in Figure 2 except that the bins at the band edges have extended length.
  • Figure 4 illustrates an example similar to the example in Figure 2 except that the bins at the band edges have shorter length.
  • Figure 5 illustrates the CQI group shifting with wrapping around the band edges.
  • Figure 6 illustrates an embodiment of the invention performed by a radio base station.
  • Figure 7 illustrates an embodiment of the invention performed by a User Equipment.
  • Figure 8 illustrates schematically a radio base station capable of performing the method according to Fig. 6.
  • Figure 9 illustrates schematically a User Equipment capable of performing the method according to Fig. 7.
  • each bin or group contains 6 RBs.
  • each bin or group contains 6 RBs.
  • their average value CQI 0 is reported.
  • their average value CQI 1 is reported, and so on.
  • Figure 2 illustrates the frequency domain averaging with time varying borders between the RB bins in accordance with an embodiment of the invention.
  • the offset is 3 RBs.
  • the first reported value is an average over RB 0-5
  • the next one is an average over RB 6-11, and so on.
  • the borders have been offset 3 RBs so the first reported value is an average over RB 3-8, the next one is an average over RB 9-14, and so on.
  • the offset value may be determined by the trade-off between the need for sufficiently good frequency resolution and the need for sufficient accuracy of the amplitude of the CQI value itself.
  • High frequency resolution is required when it is assumed that the quality of the radio channel varies a lot in the frequency domain, i.e. certain narrow frequency bands are significantly better or worse than their neighboring frequency bands, and that it is desired to schedule data in such narrow frequency bands having high quality.
  • the characteristics of the radio channel have effect on the determination of suitable offset value, but also the scheduling algorithm and the number of UEs to be scheduled simultaneously.
  • Figure 4 shows an example where the bins at the frequency band edges are of shorter length (3 RBs) instead of extended length. In this case there will be 6 CQI values reported at each time instead of 5. Other variants are possible.
  • the CQI RB grouping and shift pattern could be configured by the base station, e.g. eNode B, through higher layer signaling such as RRC or through MAC control.
  • the eNodeB could configure a certain shift pattern.
  • the CQI could be shifted by two RB for each report. An RB group that is shifted beyond the band end could be shorted while the RB groups in the beginning are extended, see Figure 5.
  • FIG. 6 illustrates an embodiment of the invention carried out in a radio base station such as an eNodeB.
  • the base station receives CQI reports from the UE constituted of frequency domain averaged CQI values calculated for a bin of resource blocks (RBs) .
  • the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described.
  • the base station performs time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as previously described.
  • Figure 7 illustrates an embodiment of the invention carried out in a User Equipment, UE.
  • the UE calculates said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value as previously described.
  • the UE sends CQI reports constituted of said frequency domain averaged CQI values, calculated for a bin of resource blocks (RBs) , to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as previously described.
  • RBs resource blocks
  • FIG. 8 illustrates schematically a base station 800 capable of carrying out the method illustrated in Fig. 6.
  • the base station comprises a receiver unit 801 capable of receiving CQI reports from the UE constituted of frequency domain averaged CQI values.
  • the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described.
  • He base station furthermore comprises a processing unit capable of performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as described in the foregoing.
  • FIG. 9 illustrates schematically a UE capable of carrying out the method illustrated in Fig. 7.
  • the UE comprises a processing unit 901 capable of calculating said frequency domain averaged CQI values for a bin of resource blocks (RBs) .
  • RBs resource blocks
  • the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described.
  • the UE furthermore comprises a transmitter 902 capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station, where the base station then performs time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
  • a transmitter 902 capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station, where the base station then performs time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to a method in a radio base station for improving the frequency resolution in the reporting of CQI, from a UE, where each CQI report is constituted of frequency domain averaged CQI values, each value being calculated for a bin of resource blocks (RBs). The method comprises the steps of - receiving CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value; - performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks; whereby an improved frequency resolution is achieved. The invention furthermore relates to a method in a UE, a base station and a UE.

Description

METHOD AND ARRANGEMENT FOR FEEDING BACK CQI VALUES IN A
TELECOMMUNICATION SYSTEM
FIELD OF THE INVENTION
The present invention relates to reporting of downlink channel quality information (CQI) .
BACKGROUND
In the LTE concept defined in the ongoing 3GPP work on standardization, the downlink will support fast channel dependent scheduling in both the time and frequency domains. A conventional downlink scheduling concept is described in the following. A base station, which in LTE is referred to as an eNodeB, communicating with a User Equipment, UE, transmits reference signals to UE. The reference signals can be used by UE to determine the present downlink channel quality. After having determined the downlink channel quality on the basis of the received reference signals, UE 101 sends one or more channel state feedback reports, which in this context typically are referred to as Channel Quality Indication (CQI) reports, back to eNodeB. In eNodeB 100, the content of the one or more CQI reports can be retrieved and used by a scheduler.
Thus, in order for eNodeB to be able to perform efficient frequency domain scheduling of downlink data transmissions, the UEs need to provide eNodeB with detailed downlink channel quality information (CQI) . For optimum downlink performance the CQI report should contain one CQI report per resource block (RB) . However, this would give a large control channel overhead in the uplink, so the CQI information needs to be compressed somehow. Many CQI compression schemes have been proposed in 3GPP. One of the more straightforward CQI compression schemes that have been proposed is to do frequency domain averaging over several RBs and report the average values only. If the total number of RBs is Ntot and each average is based on Nbin RBs, the number of CQI values that need to be reported in the uplink will be reduced to (approximately) Ntot/Nbin instead of Ntot. For example, with NtOt=IOO and Nbin=4, only 100/4=25 values need to be reported, which is significantly less than 100 values.
However, when the CQI is averaged over several RBs in the frequency domain, the frequency resolution will suffer, since there will not be a unique CQI value for each RB but a common CQI value for several adjacent RBs. This is the price for the reduction in control channel overhead.
CQIs are typically reported periodically by the UE so that eNodeB always has fairly recent channel quality information available when data is about to be scheduled in downlink by eNodeB to the UE. One possibility for eNodeB is to also perform some time domain filtering in order to improve the accuracy of the frequency domain averaged CQI values.
The problem with this solution is that it would not improve the frequency resolution, since there would still only be one CQI value per Nbin RBs.
SUMMARY
It is therefore an object of the present invention to provide a method that improves the frequency resolution of the downlink channel quality information without increasing the number of CQI values to be reported. One embodiment of the present invention relates to a method in a radio base station for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided by a UE, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) . The method comprises the steps of
- receiving CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the
RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value;
- performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks;
whereby an improved frequency resolution is achieved.
Hereby, the receiving side is able to achieve improved frequency resolution by performing time domain filtering of subsequent CQI reports, the borders between the bins are varied in time instead of being fixed. Frequency domain averaging is applied to the CQI values, meaning that one CQI value is reported for every bin of Nbin RBs rather than one CQI value for every RB. Thus, according to the invention, the number of CQI values to report can be kept low while an improved frequency resolution can be achieved.
A further embodiment of the invention relates to a method in a User Equipment (UE) for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) . The method is characterized by the steps of
- calculating said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value;
- providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
A further embodiment of the invention relates to a radio base station capable of receiving reports of downlink channel quality information, CQI, from a UE, where each CQI report is constituted of frequency comain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) . The radio base station comprises
- a receiver unit capable of receiving CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value; and
- a processing unit capable of performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
A further embodiment of the invention relates to a User Equipment, UE, capable of reporting downlink channel quality information, CQI, to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) . The UE comprises - a processing unit capable of calculating said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value;
- a transmitter capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks .
The offset value to be applied and the rules on when and how to apply the offset value may be a predefined fixed value, e.g. set by a standard. Alternatively, the UE can be configured e.g. by higher layer signaling such as RRC or through MAC control. Such configuration may include a set of bin patterns indicating where the UE should measure and how to report CQI from this set in a certain order. According to a specific embodiment of the invention, the offset value can be variable to adjust to e.g. radio channel characteristics, scheduling algorithm and the number of UEs to be scheduled simultaneously.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 (prior art) illustrates an example of frequency domain averaging with Nbin=6 and Ntot=33. The borders between the bins are fixed, i.e. the same at time=0, time=l and time=2.
Figure 2 illustrates an example of frequency domain averaging with Nbin=6 and Ntot=33. The borders between the bins varies in time according to the invention, i.e. not the same at time=0, time=l and tirne=2.
Figure 3 illustrates an example similar to the example in Figure 2 except that the bins at the band edges have extended length.
Figure 4 illustrates an example similar to the example in Figure 2 except that the bins at the band edges have shorter length.
Figure 5 illustrates the CQI group shifting with wrapping around the band edges.
Figure 6 illustrates an embodiment of the invention performed by a radio base station.
Figure 7 illustrates an embodiment of the invention performed by a User Equipment.
Figure 8 illustrates schematically a radio base station capable of performing the method according to Fig. 6.
Figure 9 illustrates schematically a User Equipment capable of performing the method according to Fig. 7.
DETAILED DESCRIPTION
Previously known frequency domain averaging of CQI values is illustrated in Figure 1. In this example, each bin or group contains 6 RBs. At time=0, instead of reporting the CQI values for RBs 0-5, their average value CQI 0 is reported. Likewise, instead of reporting the CQI values for RBs 6-11, their average value CQI 1 is reported, and so on. The same borders (at RB=O, RB=6, RB=12, etc) are applied for the frequency domain averaging at time=l, time=2 and all other times. Time domain filtering can be performed by e.g. taking the average of CQI 0 at time = t and CQI 0 at time = t+1.
Figure 2 illustrates the frequency domain averaging with time varying borders between the RB bins in accordance with an embodiment of the invention. In this example, the offset is 3 RBs. Thus, at time=0, the first reported value is an average over RB 0-5, the next one is an average over RB 6-11, and so on. But at tirne=l, the borders have been offset 3 RBs so the first reported value is an average over RB 3-8, the next one is an average over RB 9-14, and so on.
With this approach, time domain filtering will help to improve the frequency resolution. The receiving side can estimate e.g. the CQI for RB 3-5 as the average of CQI 0 at time=0 and CQI 0 at time=l, while the CQI for RB 6-8 can be estimated with the average of CQI 1 at time=0 and CQI 0 at time=l.
It is of course possible to use other offset values. If 2 RBs is used as offset instead of 3 as in the previous example, then it would take until t=3 before the offset is back at value zero again in the example of 6 RBs in each bin used above. The benefit of smaller offset value is of course an even better frequency resolution, but on the other hand it will take longer time to achieve the CQI value due to longer time domain filtering.
The offset value may be determined by the trade-off between the need for sufficiently good frequency resolution and the need for sufficient accuracy of the amplitude of the CQI value itself. High frequency resolution is required when it is assumed that the quality of the radio channel varies a lot in the frequency domain, i.e. certain narrow frequency bands are significantly better or worse than their neighboring frequency bands, and that it is desired to schedule data in such narrow frequency bands having high quality. Thus, the characteristics of the radio channel have effect on the determination of suitable offset value, but also the scheduling algorithm and the number of UEs to be scheduled simultaneously.
Special care is needed for the CQIs at the frequency band edges (CQI 0 and CQI 4 in the example) . If it is desired to cover the entire frequency band at each report occasion, the size of the bins can be adjusted e.g. as in Figure 3, where CQI 4 has been extended to cover 9 RBs at time=0 and time=2, and CQI 0 has been extended to cover 9 RBs at time=l.
Figure 4 shows an example where the bins at the frequency band edges are of shorter length (3 RBs) instead of extended length. In this case there will be 6 CQI values reported at each time instead of 5. Other variants are possible.
The CQI RB grouping and shift pattern could be configured by the base station, e.g. eNode B, through higher layer signaling such as RRC or through MAC control. For a certain RB grouping the eNodeB could configure a certain shift pattern. For example, the CQI could be shifted by two RB for each report. An RB group that is shifted beyond the band end could be shorted while the RB groups in the beginning are extended, see Figure 5.
Figure 6 illustrates an embodiment of the invention carried out in a radio base station such as an eNodeB. In step 601, the base station receives CQI reports from the UE constituted of frequency domain averaged CQI values calculated for a bin of resource blocks (RBs) . In the calculation of the CQI values, the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described. In step 602, the base station performs time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as previously described.
Figure 7 illustrates an embodiment of the invention carried out in a User Equipment, UE. In step 701, the UE calculates said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value as previously described. In step 702, the UE sends CQI reports constituted of said frequency domain averaged CQI values, calculated for a bin of resource blocks (RBs) , to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as previously described.
Figure 8 illustrates schematically a base station 800 capable of carrying out the method illustrated in Fig. 6. For the sake of clarity, any feature not relevant to this invention has been left out. The base station comprises a receiver unit 801 capable of receiving CQI reports from the UE constituted of frequency domain averaged CQI values. In the calculation of the CQI values, the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described. He base station furthermore comprises a processing unit capable of performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks as described in the foregoing.
Figure 9 illustrates schematically a UE capable of carrying out the method illustrated in Fig. 7. For the sake of clarity, any feature not relevant to this invention has been left out also from this figure. The UE comprises a processing unit 901 capable of calculating said frequency domain averaged CQI values for a bin of resource blocks (RBs) . In the calculation of the CQI values, the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value as previously described. The UE furthermore comprises a transmitter 902 capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station, where the base station then performs time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
It should be noted that although terminology from 3GPP LTE has been used in this disclosure to exemplify the invention, this should not be seen as limiting the scope of the invention to only the aforementioned system. Other wireless FDM based systems, including e.g. WiMax as well as future wireless systems, may also benefit from exploiting the ideas covered by embodiments of this invention.
The invention should not be construed as to be limited to the disclosed embodiments, but is intended to cover various modifications within the scope of the appended claims.

Claims

1. A method in a radio base station for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided by a UE, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs), characterized by the steps of
- receiving (601) CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value;
- performing (602) time donain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks;
whereby an improved frequency resolution is achieved.
2. A method according to claim 1, comprising the step of
configuring the UE to apply a set of bin patterns indicating the offset value and how to report CQI from this set in a certain order.
3. A method according to claim 1, whereby the offset value is a predefined value that is known by the UE and the base station.
4. A radio base station (803), capable of receiving reports of downlink channel quality information, CQI, from a UE
(900), where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) characterized by - a receiver unit (801) capable of receiving CQI reports from the UE constituted of frequency domain averaged CQI values, wherein the borders between the RB bins for consecutive CQI reports have been varied over time by the application of a RB offset value; and
- a processing unit (802) capable of performing time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
5. A radio base station (800) according to claim 4, comprising means for configuring the UE (900) to apply a set of bin patterns indicating the offset value and how to report CQI from this set in a certain order.
6. A radio base station (800) according to claim 4, wherein said offset value is a predefined value that is known by both the UE and the base station.
7. A method in a User Equipment, UE, for improving the frequency resolution in the reporting of downlink channel quality information, CQI, provided to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs), characterized by the steps of
- calculating (701) said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value;
- providing (702) CQI reports constituted of said frequency domain averaged CQI values to the radio base station for time _
domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks;
whereby an improved frequency resolution is achieved.
8. A method according to claim 7, comprising the step of being configured by the base station to apply a set of bin patterns indicating the offset value and how to report CQI from this set in a certain order.
9. A method according to claim 7, whereby the offset value is a predefined value that is known by the UE and the base station.
10. User Equipment, UE, (9CO) capable of reporting downlink channel quality information, CQI, to a radio base station, where each CQI report is constituted of frequency domain averaged CQI values, each such value is calculated for a bin of resource blocks (RBs) , characterized in
a processing unit (901) capable of calculating said frequency domain averaged CQI values, wherein the borders between the resource block bins for consecutive CQI reports are varied over time by the application of a RB offset value;
- a transmitter (902) capable of providing CQI reports constituted of said frequency domain averaged CQI values to the radio base station for time domain filtering of subsequent CQI reports such that the CQI for the resource blocks are estimated by averaging the CQI values of consecutive CQI reports that overlap the same resource blocks.
11. A UE according to claim 10, capable of being configured by the base station to apply a set of bin patterns indicating the offset value and how to report CQI from this set in a certain order.
12. A UE according to claim 10, wherein said offset value is a predefined value that is known by both the UE and the base station.
PCT/SE2008/050824 2007-08-15 2008-07-02 Method and arrangement for feeding back cqi values in a telecommunication system WO2009022970A1 (en)

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