WO2009010906A2 - Link adaptation by channel bundling in a wireless communication system - Google Patents
Link adaptation by channel bundling in a wireless communication system Download PDFInfo
- Publication number
- WO2009010906A2 WO2009010906A2 PCT/IB2008/052798 IB2008052798W WO2009010906A2 WO 2009010906 A2 WO2009010906 A2 WO 2009010906A2 IB 2008052798 W IB2008052798 W IB 2008052798W WO 2009010906 A2 WO2009010906 A2 WO 2009010906A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmitter
- link adaptation
- communication system
- channel
- communication
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
-
- 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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Definitions
- the present invention relates to a method of reducing interference in a communication system. More specifically the invention relates to a new link adaptation scheme applicable in various communication systems. The invention also relates to a corresponding computer program product and communication device.
- Link adaptation is a technique applied in networks, where different Physical layer (PHY) modes are available for data transmission, and conventionally it consists of a function that chooses the appropriate PHY mode, under the given channel conditions. Physical layers provide multiple data transmission rates by employing different modulation and channel coding schemes.
- PHY Physical layer
- PHY modes consisting of a modulation and coding scheme
- Current link adaptation schemes choose one of the available PHY modes for the oncoming data transfer, based on some decision variables such as the packet error rate (PER) and/or measurements on channel quality, performed by the mobile stations (MSs) during idle times.
- PER packet error rate
- MSs mobile stations
- the performance of the receiver is highly affected by the number of simultaneous users, the relative delay between their transmissions and the power of each interferer.
- channel bundling the transmitter occupies at least two channels, and reduces the number of potential interferers to its receiver by one in case two channels are used.
- the transmitter blocks these channels so that other users cannot use these channels while the transmitter is occupying these channels.
- SINR signal to interference and noise ratio
- channel bundling offers more capacity to the link and in case a lower PHY mode is used, this method can consequently compensate for the longer transmission time required.
- a computer program product comprising instructions for implementing the method according the first aspect of the invention when loaded and run on computer means of the transmitter.
- a communication device as recited in claim 10, the device being arranged for implementing the method according to the first aspect of the present invention.
- Fig.1 is a block diagram of the environment, wherein the teachings of the invention may be applied;
- - Fig.2 is a block diagram of the adaptation block capable of applying channel bundling in accordance with the present invention
- - Fig.3 is a simplified flow chart in accordance with an embodiment of the present invention
- - Fig.4 shows four transmission channels along a timeline, where two channels are bundled for simultaneous transmission
- - Fig.5 shows four transmission channels on which data transmission starts at different time instants
- - Fig.6 shows four transmission channels on which data transmission starts simultaneously
- - Fig.7 is diagram showing simulation results.
- C-DCF coded distributed coordination function
- MC-CDMA multi carrier CDMA
- FDMA frequency division multiple access
- An example of a communication system that operates in accordance with the MC-CDMA scheme is IEEE 802.1 1 a/e which has become a worldwide WLAN standard.
- MAC medium access control
- the DCF as the basic access mechanism of the IEEE 802.1 1 MAC, achieves automatic medium sharing between compatible devices through the use of carrier-sense multiple access with collision avoidance (CSMA/CA).
- CSMA/CA carrier-sense multiple access with collision avoidance
- the distributed inter-frame space is used by devices operating under the DCF to transmit data frames.
- a device using the DCF has to follow two medium access rules: (1 ) the device will be allowed to transmit only if its carrier-sense mechanism determines that the medium has been idle for at least DIFS time; and (2) in order to reduce the collision probability among multiple devices accessing the medium, the station will select a random backoff interval after deferral, or prior to attempting to transmit another frame after a successful transmission.
- the device which has a data packet to transmit draws a random number between 0 and contention window, which determines the duration of the backoff timer in number of timeslots.
- Fig.1 shows an environment, where the teachings of the present invention can be applied.
- wireless communication devices 101 in this example mobile phone handsets 101 .
- these devices 101 are arranged to communicate in accordance with the IEEE 802.1 1 a standard with an access point 103.
- the access point 103 may further relay the requests sent by the devices 101 to a server 105.
- a wired connection can be arranged between the access point 103 and the server 105.
- the wireless devices take advantage of the CSMA/CA as explained above.
- the wireless devices 101 may simultaneously communicate with the same access point by using other channels or with other access points using the same communication channel and the same or different communication protocol thereby causing interference in the communication system.
- Fig.2 shows a simplified block diagram of the link adaptation block 201 that is part of the communication device 101 .
- the link adaptation block 201 comprises three blocks in Fig.2, namely a channel bundling block 203, a PHY mode adaptation block 205 and a power control block 207. As can be seen from the figure, these blocks are arranged to communicate with each other so that when one of these blocks is making a decision, the operation of the other blocks can be taken into account in the decision making.
- the link adaptation block 201 takes as an input determined interference level and outputs the number of transmission channels, with selected PHY mode and transmission power level.
- Fig.3 shows a flow chart depicting the method of reducing interference in a communication system in accordance with an embodiment of the invention.
- the method depicted in the flow chart of Fig.1 can be applied in a wireless device 101 , which intends to transmit data to the access point 103.
- the wireless device 101 determines the interference level on the radio channel it intends to use for transmission. For determining the interference, it may for instance measure signal to interference ratio (SIR) of a pilot signal received from the access point 103 or PER or any other relevant value. The determined interference level is then fed to the link adaptation block 201 . Then in step 303, the interference level is compared to a pre-defined threshold value. The comparison can be done in each of the blocks contained in the link adaptation block 201 . Alternatively there could be one element for the comparison so that this element would then inform the other blocks in the link adaptation block 201 . The threshold value could also be adjusted dynamically depending on some variables in the network. For instance when transmitting data more interference is tolerated than when transmitting speech. Thus, the interference threshold may depend on the type of transmission. If the interference level is below the threshold, then there is no need for link adaptation and the transmission can take place in step 305 once there are free resources using the intended modulation and coding scheme.
- SIR signal to interference ratio
- channel bundling is applied in step 307 by the channel bundling block 203.
- the principle of channel bundling is shown in Fig.4.
- the data is transmitted simultaneously on channels 2 and 3 as shown in the figure.
- Channel 1 is not suitable for transmission, since during the backoff period it was detected that there was another terminal already transmitting on this channel.
- channels 2 and 3 are free because during the backoff period, which in this example is four timeslot periods, these channels were determined to be free.
- channel 4 is not suitable for transmission during the desired period as it was occupied.
- the backoff processes do not necessarily have to have the same backoff parameters. Usually, even if the backoff parameters are the same on all channels, depending on the traffic on the channels, some backoff countdowns will end earlier than others.
- the device 101 may then start multiple transmissions in parallel on the different channels, on which the back-off has been completed. There are two alternatives:
- the device 101 starts transmission on each channel independently, once a backoff has been completed. In this case the transmissions on different channels do not usually start at the same time. This is shown in Fig.5.
- the device 101 starts transmission on multiple channels in parallel, but waits until the backoff on a certain number of (up to all) channels has been completed to transmit the data in parallel, e.g. at a higher "bundle data rate". This is shown in Fig.6.
- step 309 it is determined whether there is need to change the PHY mode, i.e. the modulation and/or coding scheme. If there is no need to change the PHY mode, then the data can be transmitted on the selected channels. On the other hand, if in step 309 it is determined that PHY needs to be changed, then in step 31 1 , the wireless device 101 that intends to transmit the data changes the PHY as decided in step 309. This is done by the PHY mode adaptation block 205. Thus, if both the channel bundling adjustment and the change of PHY mode are done, the method can be referred to as a two dimensional link adaptation method. Then the data is transmitted in step 305. Also, if in step 309 it was determined that there is no need to change the PHY, then data is transmitted in step 305 without changing the PHY mode. After this the procedure comes to an end or it may restart again by determining the interference level in step 301 .
- the PHY mode i.e. the modulation and/or coding scheme.
- the IEEE 802.1 1 a has eight PHY modes as shown in Table 1 .
- PHY mode 3 i.e. QPSK modulation with code rate 1/2 can be switched to operate on two parallel channels in mode 1 with BPSK modulation and code rate V ⁇ .
- the final data rate is 12 Mbps.
- the data rate can be kept constant, if this is wanted. It is of course also possible to transmit simultaneously on multiple channels with increased PHY mode. This would mean that the transmission would be completed in a much shorter time.
- Table 1 Eight PHY modes of the IEEE 802.1 1 a.
- Fig.7 shows some simulation results. SINR at the detector, i.e. at the device
- the SINR value in the diagram is the average over 10 000 runs with different relative delays among concurrent user transmissions.
- the graphs show that performance decreases almost linearly as a function of the interfering power.
- the MUD manages to provide a positive SINR even in the case when all the three interfering signals are 5 dB higher than the carrier strength.
- MAI high multiple access interference
- the channel bundling can also be applied by a link adaptation algorithm as an alternative to power adjustment, for instance by a power control algorithm.
- a link adaptation algorithm as an alternative to power adjustment, for instance by a power control algorithm.
- the device 101 when receiving from the network a power control command to lower the transmission power, the device 101 would perform channel bundling possible simultaneously lowering the PHY mode, but without adjusting the transmission power.
- the power control block 207 would control the channel bundling and PHY mode adaptation blocks.
- the channel bundling can be applied by a link adaptation algorithm in conjunction with power adjustment, for example by a power control algorithm.
- the invention equally relates to a computer program product that is able to implement any of the method steps of the embodiments of the invention when loaded and run on computer means of the transmitting device 101 .
- the invention equally relates to an integrated circuit that is arranged to perform any of the method steps in accordance with the embodiments of the invention.
- a computer program may be stored/distributed on a suitable medium supplied together with or as a part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope of the invention.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT08789274T ATE525883T1 (en) | 2007-07-19 | 2008-07-11 | LINK ADJUSTMENT SCHEME |
JP2010516621A JP5608554B2 (en) | 2007-07-19 | 2008-07-11 | Link adaptation by channel bundling in wireless communication systems |
US12/668,469 US20100190520A1 (en) | 2007-07-19 | 2008-07-11 | Link adaptation by channel bundling in a wireless communication system |
EP08789274A EP2179622B1 (en) | 2007-07-19 | 2008-07-11 | Link adaptation scheme |
CN200880025238.2A CN101755476B (en) | 2007-07-19 | 2008-07-11 | Link adaptation scheme |
US16/395,450 US11071093B2 (en) | 2007-07-19 | 2019-04-26 | Link adaption by channel bundling in a wireless communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07301251.0 | 2007-07-19 | ||
EP07301251 | 2007-07-19 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/668,469 A-371-Of-International US20100190520A1 (en) | 2007-07-19 | 2008-07-11 | Link adaptation by channel bundling in a wireless communication system |
US16/395,450 Continuation US11071093B2 (en) | 2007-07-19 | 2019-04-26 | Link adaption by channel bundling in a wireless communication system |
Publications (2)
Publication Number | Publication Date |
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WO2009010906A2 true WO2009010906A2 (en) | 2009-01-22 |
WO2009010906A3 WO2009010906A3 (en) | 2009-05-07 |
Family
ID=40120113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2008/052798 WO2009010906A2 (en) | 2007-07-19 | 2008-07-11 | Link adaptation by channel bundling in a wireless communication system |
Country Status (8)
Country | Link |
---|---|
US (2) | US20100190520A1 (en) |
EP (1) | EP2179622B1 (en) |
JP (1) | JP5608554B2 (en) |
KR (1) | KR101468908B1 (en) |
CN (1) | CN101755476B (en) |
AT (1) | ATE525883T1 (en) |
TW (1) | TWI455542B (en) |
WO (1) | WO2009010906A2 (en) |
Cited By (4)
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US20100309779A1 (en) * | 2009-06-05 | 2010-12-09 | Broadcom Corporation | Carrier sense multiple access (CSMA) for multiple user, multiple access, and/or MIMO wireless communications |
WO2011097758A1 (en) * | 2010-02-11 | 2011-08-18 | Telefonaktiebolaget L M Ericsson (Publ) | Link adaptation in type-ii relay network |
JP2011250401A (en) * | 2010-05-26 | 2011-12-08 | Intel Corp | Device, system and method of wireless communication over non-contiguous channels |
JP2013537783A (en) * | 2010-08-23 | 2013-10-03 | インテル・コーポレーション | Mechanism for accessing wide channels in overlapping networks |
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US8451726B2 (en) * | 2008-12-31 | 2013-05-28 | Stmicroelectronics S.R.L. | Link adaptation in wireless networks |
US8886126B2 (en) * | 2009-07-09 | 2014-11-11 | Qualcomm Incorporated | Resolution algorithms for multi-radio coexistence |
US9521557B2 (en) * | 2013-06-03 | 2016-12-13 | Qualcomm Incorporated | Methods and apparatus for clear channel assessment |
WO2016106497A1 (en) * | 2014-12-29 | 2016-07-07 | 华为技术有限公司 | Method, device, terminal device and system for adjusting working state of aggregated link |
US10333750B2 (en) * | 2016-08-15 | 2019-06-25 | Silicon Laboratories Inc. | Receiver with PHY switch based on preamble |
US11564272B2 (en) * | 2019-03-08 | 2023-01-24 | Qualcomm Incorporated | Considerations for multi-link aggregation |
CN116981100B (en) * | 2019-07-05 | 2024-06-11 | 华为技术有限公司 | Communication method and device |
CN115996433B (en) * | 2023-03-22 | 2023-06-20 | 新华三技术有限公司 | Radio resource adjustment method, device, electronic equipment and storage medium |
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2019
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US20100309779A1 (en) * | 2009-06-05 | 2010-12-09 | Broadcom Corporation | Carrier sense multiple access (CSMA) for multiple user, multiple access, and/or MIMO wireless communications |
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WO2011097758A1 (en) * | 2010-02-11 | 2011-08-18 | Telefonaktiebolaget L M Ericsson (Publ) | Link adaptation in type-ii relay network |
US9144108B2 (en) | 2010-02-11 | 2015-09-22 | Telefonaktiebolaget L M Ericsson (Publ) | Link adaptation in type-II relay network |
JP2011250401A (en) * | 2010-05-26 | 2011-12-08 | Intel Corp | Device, system and method of wireless communication over non-contiguous channels |
US8582551B2 (en) | 2010-05-26 | 2013-11-12 | Intel Corporation | Device, system and method of wireless communication over non-contiguous channels |
US9161339B2 (en) | 2010-05-26 | 2015-10-13 | Intel Corporation | Device, system and method of wireless communication over non-contiguous channels |
US9603147B2 (en) | 2010-05-26 | 2017-03-21 | Intel Corporation | Device, system and method of wireless communication over non-contiguous channels |
US10225838B2 (en) | 2010-05-26 | 2019-03-05 | Intel Corporation | Device, system and method of wireless communication over a channel bandwidth comprising first and second channels |
JP2013537783A (en) * | 2010-08-23 | 2013-10-03 | インテル・コーポレーション | Mechanism for accessing wide channels in overlapping networks |
Also Published As
Publication number | Publication date |
---|---|
KR20100044858A (en) | 2010-04-30 |
JP5608554B2 (en) | 2014-10-15 |
CN101755476A (en) | 2010-06-23 |
US20100190520A1 (en) | 2010-07-29 |
EP2179622A2 (en) | 2010-04-28 |
JP2010534023A (en) | 2010-10-28 |
CN101755476B (en) | 2014-02-19 |
TW200913606A (en) | 2009-03-16 |
US20190274120A1 (en) | 2019-09-05 |
US11071093B2 (en) | 2021-07-20 |
WO2009010906A3 (en) | 2009-05-07 |
TWI455542B (en) | 2014-10-01 |
KR101468908B1 (en) | 2014-12-04 |
ATE525883T1 (en) | 2011-10-15 |
EP2179622B1 (en) | 2011-09-21 |
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