WO2009157849A1 - Staggered cqi /ack reporting in hsdpa systems with multiple up-link control channels - Google Patents
Staggered cqi /ack reporting in hsdpa systems with multiple up-link control channels Download PDFInfo
- Publication number
- WO2009157849A1 WO2009157849A1 PCT/SE2009/050642 SE2009050642W WO2009157849A1 WO 2009157849 A1 WO2009157849 A1 WO 2009157849A1 SE 2009050642 W SE2009050642 W SE 2009050642W WO 2009157849 A1 WO2009157849 A1 WO 2009157849A1
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- WIPO (PCT)
- Prior art keywords
- user equipment
- ack
- harq
- channel quality
- nack
- Prior art date
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Classifications
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- 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
- H04L1/0026—Transmission of channel quality indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
-
- 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
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
-
- 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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method of transmitting a Channel Quality Indicator and/or HARQ ACK/NACK in a cellular radio system from a User Equipment having multiple uplink channels to the radio system is provided. The User Equipment is adapted to transmit Channel Quality Indicator in at least two of the uplink channels with the Channel Quality Indicators staggered in time in the at least two uplink channels. The different uplink channels can in one embodiment correspond to different High Speed Dedicated Physical Control Channel (HS-DPCCH) channels.
Description
STAGGERED CQI /ACK REPORTING IN HSDPA SYSTEMS WITH MULTIPLE UP-LINK CONTROL CHANNELS
P26705WO1
TECHNICAL FIELD
The present invention relates to a method and apparatus in a telecommunication system. In particular the present invention relates to a method and arrangement for improving CQI/HARQ ACK/NACK reporting in a multi carrier HSDPA operation.
BACKGROUND
In a High Speed Downlink Packet Access (HSDPA) communications system, data channels, High Speed Downlink Shared Channel (HS-DSCH), and related control channels, High Speed Shared Control Channel (HS-SCCH), are transmitted as shared channels downlink and one feedback channel, High Speed Dedicated Physical Control Channel (HS-DPCCH), is transmitted per user in the uplink.
The HS-DPCCH channel carries a Hybrid Automatic Repeat Request (HARQ)
Acknowledgement/Negative Acknowledgement (ACK/NACK) and a downlink channel quality indicator (CQI). One HARQ- ACK/NACK is fed back in the uplink for each data packet transmission in downlink.
It is , on the one hand, desired that a CQI is transmitted to the base station often enough to provide a scheduler in the base station of the HSDPA system with adequate information to be able to select appropriate data transmission formats for the user. On the other hand, it is desired to keep the control signaling overhead as low as possible. Hence, the CQIs should not be transmitted more often than necessary. The CQIs from a user are normally transmitted periodically in accordance with a configurable CQI feedback cycle. In Third
Generation Partnership Program (3GPP) Wideband Code Division Multiple Access (WCDMA) Release No. 7 (Rel-7), a possibility has been introduced for enabling the CQI reporting frequency vary dynamically depending on the user' s data activity, so that the CQIs are transmitted more often during data activity and less often during data inactivity.
In order to increase the user peak rates and system capacity, simultaneous HSDPA transmission on several downlink carrier frequencies to a user can be introduced. Multi- carrier HSDPA operation with two downlink carrier frequencies is introduced in 3GPP WCDMA Rel-8.
One way to support HSDPA operation on multiple carriers is to duplicate the data and control signaling that has been specified for single-carrier HSDPA operation in earlier 3GPP releases.
For the control signaling in downlink, this means that each UE can be given the task to monitor not only one HS-SCCH set, but one HS-SCCH set per downlink carrier. Likewise, for the control signaling in uplink, the UE can be required to transmit not only one HS- DPCCH channel, but one HS-DPCCH channel per downlink carrier allocated to the UE.
Hence there exists a need for a method and an arrangement for transmitting more than one HS-DPCCH channel in parallel from the UE.
SUMMARY
It is an object of the present invention to provide an efficient method and apparatus for transmitting more than one CQI report in parallel in different uplinks.
This object and others are obtained by the method and apparatus as set out in the appended claims. Briefly, this and other objects of the present invention are accomplished by application of time staggering between the CQI reporting patterns in the uplink
corresponding to different downlink carriers. As has been recognized by the inventor, one solution is to let the UE transmit multiple simultaneous Code Division Multiplex (CDM)- multiplexed HS-DPCCH channels in parallel. However, when more than one HS-DPCCH channel is transmitted in parallel from the UE using CDM multiplexing, a higher UE transmit power will be required compared to transmitting a single HS-DPCCH channel. This can decrease uplink coverage, because when the UE is far from the base station, the UE may not have enough transmit power to transmit all HS-DPCCH channels simultaneously.
Thus, in accordance with one embodiment of the present invention a method of transmitting a Channel Quality Indicator in a cellular radio system from a User Equipment having multiple uplink channels to the radio system is provided. The User Equipment is adapted to transmit Channel Quality Indicator in at least two of the uplink channel with the Channel Quality Indicators staggered in time in the at least two uplink channels. The different uplink channels can in one embodiment correspond to different High Speed Dedicated Physical Control Channel (HS-DPCCH) channels.
The invention also extends to a User Equipment adapted to transmit staggered CQI reports in accordance with the above.
Using the method and apparatus in accordance with the invention will provide an improved CQI reporting. In particular, when both CQIs and HARQ- ACK/N ACKs are staggered such that simultaneous transmissions on more than one HS-DPCCH channel at a time is avoided, the uplink coverage can be equal to the uplink coverage in single-carrier HSDPA operation.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in more detail by way of non-limiting examples and with reference to the accompanying drawings, in which:
- Fig. 1 is a view illustrating a cellular radio system system,
- Fig. 2 is a view illustrating time staggered CQI reports, and
- Fig. 3 is a flow chart illustrating some procedural steps performed when transmitting CQI reports from a UE supporting multiple uplink channels.
DETAILED DESCRIPTION
In Fig.l a view illustrating a cellular WCDMA radio system 100 is shown. The system comprises a number of radio base stations here denoted Node B 101. The Node Bs 101 can be connected to a central node such as a Radio Network Controller (RNC) 105. The base stations 101 are further connectable to mobile stations also denoted User Equipments (UE) 103 of the radio system 100 over a radio interface. The UE can further comprise a unit adapted to generate and transmit CQI feedback on multiple uplink channels to a radio base station NodeB to which the UE is connected. In order to schedule transmission of data and signaling information to the mobile stations the radio base station is provided with a scheduler 109. The UE 103 further comprises a module 104 adapted transmit the Channel Quality Indicators and/or HARQ ACK/NACK staggered in time.
For each downlink carrier allocated to a user, the UE transmits one HS-DPCCH channel that carries HARQ- ACK/NACK and CQI for that user. If the HS-DPCCH channels are transmitted in a time-aligned fashion the UE transmit power will have peaks when several HARQ- ACK/NACKs or CQIs are transmitted simultaneously. In order to maximize the uplink coverage, it is desired to average the UE transmit power over time.
In Figure 2, a transmission pattern for generating a sufficient average transmission power is depicted. The figure shows a way to avoid the UE transmit power peak by staggering the CQI feedback cycles for different HS-DPCCH channels in time. One way to achieve this staggering is to introduce a time offset parameter for the CQI feedback pattern for each (additional) HS-DPCCH channel.
The staggering can in accordance with one embodiment be applied all the time or in periods where coverage can be limited. To determine when to apply a staggering between the different uplink HS-DPCCH channels the UE can be adapted to autonomously invoke staggering when the UE experiences a transmit power limitation. In accordance with one embodiment staggering can be controlled by the network for example by transmitting control commands causing the UE to make use of staggering. The network could control this either by higher-layer reconfiguration from the RNC or via lower-layer signaling, e.g. orders via HS-SCCH from the base station.
In accordance with one embodiment the time staggering can be tied to the Rel-7 feature for CQI reporting reduction, so that the time staggering only applies to the reduced CQI reporting patterns, which are used when a user has a low downlink data activity.
The HARQ- ACK/NACKs can also be staggered by configuring the transmissions to avoid to schedule HSDPA transmissions to the same user simultaneously on several downlink carriers.
In Fig. 3 a flow chart illustrating some procedural steps performed when transmitting CQI reports and/or HARQ ACK/NACKs from a User Equipment supporting multiple uplink channels is shown. First, in a step 301, CQI Reports and/or HARQ ACK/NACKs for the different uplink channels are generated. Then, in a step 303, the CQI Reports and/or HARQ ACK/NACKs for the different uplink channels are transmitted time staggered.
In accordance with one embodiment staggering can be controlled by the network for example by transmitting control commands causing the UE to make use of staggering. The network can be configured to perform the control either by higher-layer reconfiguration from the Radio Network Controller (RNC) or via lower-layer signaling, e.g. orders via the High Speed Shared Control Channel (HS-SCCH) from the radio base station.
In accordance with one embodiment the time staggering can be tied to the Rel-7 feature for CQI reporting reduction, so that the time staggering only applies to the reduced CQI reporting patterns, which are used when a user has a low downlink data activity.
The HARQ- ACK/NACKs can also be staggered by configuring the transmissions to avoid to schedule High Speed Downlink Packet Access (HSDPA) transmissions to the same user simultaneously on several downlink carriers.
When both CQIs and HARQ- ACK/NACKs are staggered such that simultaneous transmissions on more than one HS-DPCCH channel at a time is avoided, the uplink coverage can be equal to the uplink coverage in single-carrier HSDPA operation.
The method and apparatus as described herein have been described in association with a WCDMA system but can be equally applicable for other standards using multiple uplink channels such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX).
The present invention may, of course, be carried out in other ways than those specifically set forth herein without departing from essential characteristics of the invention. The present embodiments are to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.
Claims
1. A method of transmitting a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/NACK in a cellular radio system from a User Equipment having multiple uplink channels to the radio system, where a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ,
Acknowledgement/Negative Acknowledgement, ACK/NACK, is transmitted in at least two of the uplink channels characterized by the step of:
- transmitting (303) the Channel Quality Indicators and/or HARQ ACK/NACK staggered in time in the at least two uplink channels.
2. The method according to claim 1, wherein the different uplink channels correspond to different High Speed Dedicated Physical Control Channel, HS-DPCCH, channels.
3. The method according to any of claims 1 or 2, wherein the time staggering is provided by a time offset parameter for the CQI feedback pattern for each uplink channel.
4. The method according to any of claims 1 - 3, wherein the time staggering is applied in periods when coverage is determined to be limited.
5. The method according to claim 4, wherein coverage is determined to be limited when the User Equipment is power limited.
6. The method according to any of claims 1 - 5, wherein staggering of transmitted Channel Quality Indicators and/or HARQ ACK/NACK is controlled by the network.
7. The method according to any of claims 1 - 6, wherein staggering of transmitted Channel Quality Indicators and/or HARQ ACK/NACK is configured to apply only to reduced CQI reporting patterns used when a User Equipment has a low downlink data activity.
8. The method according to claim 1, wherein the HARQ- ACK/N ACKs are staggered by receiving High Speed Downlink Packet Access HSDPA transmissions scheduled to avoid transmissions to the same User Equipment simultaneously on several downlink carriers.
9. A User Equipment (103) adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/N ACK in a cellular radio system, the User Equipment having multiple uplink channels to the radio system, and the User Equipment is adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/N ACK, in at least two of the uplink channels characterized by:
- means (104) for transmitting the Channel Quality Indicators and/or HARQ ACK/N ACK staggered in time in the at least two uplink channels.
10. The User Equipment according to claim 9, wherein the different uplink channels correspond to different High Speed Dedicated Physical Control Channel, HS-DPCCH, channels.
11. The User Equipment according to any of claims 9 or 10, further comprising means for setting a time offset parameter for the CQI feedback pattern for each uplink channel.
12. The User Equipment according to any of claims 9 - 11, wherein the User Equipment is configured to apply the time staggering in periods when coverage is determined to be limited.
13. The User Equipment according to claim 12, wherein coverage is determined to be limited when the User Equipment is power limited.
14. The User Equipment according to any of claims 9 - 13, further comprising means for receiving control signals from the network for controlling the staggering of transmitted Channel Quality Indicators and/or HARQ ACK/NACK.
15. The User Equipment according to any of claims 9 - 14, wherein the User Equipment is configured to apply staggering of transmitted Channel Quality Indicators and/or HARQ ACK/NACK only to reduced CQI reporting patterns used when a user equipment has a low downlink data activity.
16. A scheduler (109) for scheduling High Speed Downlink Packet Access HSDPA transmissions to a User Equipment adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/NACK in a cellular radio system, the User Equipment having multiple uplink channels to the radio system, and the User Equipment being adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ,
Acknowledgement/Negative Acknowledgement, ACK/NACK, in at least two of the uplink channels, the scheduler being characterized by:
-means (109) for staggering the HARQ- ACK/N ACKs transmitted by the User Equipment by scheduling High Speed Downlink Packet Access, HSDPA, transmissions to avoid transmissions to the same User Equipment simultaneously on several downlink carriers.
17. A method of scheduling High Speed Downlink Packet Access HSDPA transmissions to a User Equipment adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/NACK in a cellular radio system, the User Equipment having multiple uplink channels to the radio system, and the User Equipment being adapted to transmit a Channel Quality Indicator and/or Hybrid Automatic Repeat Request, HARQ, Acknowledgement/Negative Acknowledgement, ACK/NACK, in at least two of the uplink channels, the method being characterized by the step of: - staggering the HARQ- ACK/NACKs transmitted by the User Equipment by scheduling High Speed Downlink Packet Access, HSDPA, transmissions to avoid transmissions to the same User Equipment simultaneously on several downlink carriers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7592208P | 2008-06-26 | 2008-06-26 | |
| US61/075,922 | 2008-06-26 |
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| Publication Number | Publication Date |
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| WO2009157849A1 true WO2009157849A1 (en) | 2009-12-30 |
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| PCT/SE2009/050642 WO2009157849A1 (en) | 2008-06-26 | 2009-06-02 | Staggered cqi /ack reporting in hsdpa systems with multiple up-link control channels |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011086533A1 (en) * | 2010-01-15 | 2011-07-21 | Nokia Corporation | Harq acknowledgment channel coding for 4-carrier hsdpa mimo |
| EP2398176A1 (en) * | 2010-06-18 | 2011-12-21 | Alcatel Lucent | Multi carrier network configuration |
| CN102468936A (en) * | 2010-11-09 | 2012-05-23 | 大唐移动通信设备有限公司 | Method and equipment for simultaneously transmitting acknowledgement or negative acknowledgement (ACK or NACK) feedback information and periodic channel quality indication or precoding matrix indicator or rank indication (CQI or PMI or RI) feedback bits |
| WO2013051986A1 (en) * | 2011-10-04 | 2013-04-11 | Telefonaktiebolaget L M Ericsson (Publ) | Sector based hs-dpcch transmission for multi-flow hsdpa transmissions |
| EP2793416A1 (en) * | 2013-04-15 | 2014-10-22 | Vodafone IP Licensing limited | High speed uplink control channels |
| US9137642B2 (en) | 2013-03-20 | 2015-09-15 | Google Inc. | Multi-cast optimized medium access method for wireless network |
| US9319898B2 (en) | 2012-08-29 | 2016-04-19 | Samsung Electronics Co., Ltd. | Wireless communication system with rate selection mechanism and method of operation thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011086533A1 (en) * | 2010-01-15 | 2011-07-21 | Nokia Corporation | Harq acknowledgment channel coding for 4-carrier hsdpa mimo |
| US9401781B2 (en) | 2010-01-15 | 2016-07-26 | Nokia Technologies Oy | HARQ acknowledgment channel coding for 4-carrier HSDPA MIMO |
| EP2398176A1 (en) * | 2010-06-18 | 2011-12-21 | Alcatel Lucent | Multi carrier network configuration |
| WO2011157365A1 (en) * | 2010-06-18 | 2011-12-22 | Alcatel Lucent | Multi carrier network configuration |
| CN102468936A (en) * | 2010-11-09 | 2012-05-23 | 大唐移动通信设备有限公司 | Method and equipment for simultaneously transmitting acknowledgement or negative acknowledgement (ACK or NACK) feedback information and periodic channel quality indication or precoding matrix indicator or rank indication (CQI or PMI or RI) feedback bits |
| CN102468936B (en) * | 2010-11-09 | 2014-12-10 | 大唐移动通信设备有限公司 | Method and equipment for simultaneously transmitting acknowledgement or negative acknowledgement (ACK or NACK) feedback information and periodic channel quality indication or precoding matrix indicator or rank indication (CQI or PMI or RI) feedback bits |
| WO2013051986A1 (en) * | 2011-10-04 | 2013-04-11 | Telefonaktiebolaget L M Ericsson (Publ) | Sector based hs-dpcch transmission for multi-flow hsdpa transmissions |
| US9319898B2 (en) | 2012-08-29 | 2016-04-19 | Samsung Electronics Co., Ltd. | Wireless communication system with rate selection mechanism and method of operation thereof |
| US9137642B2 (en) | 2013-03-20 | 2015-09-15 | Google Inc. | Multi-cast optimized medium access method for wireless network |
| US9432145B2 (en) | 2013-03-20 | 2016-08-30 | Google Inc. | Multi-cast optimized medium access method for wireless network |
| EP2793416A1 (en) * | 2013-04-15 | 2014-10-22 | Vodafone IP Licensing limited | High speed uplink control channels |
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