WO2005055464A1 - Call case controlled bler target setting - Google Patents
Call case controlled bler target setting Download PDFInfo
- Publication number
- WO2005055464A1 WO2005055464A1 PCT/SE2003/001869 SE0301869W WO2005055464A1 WO 2005055464 A1 WO2005055464 A1 WO 2005055464A1 SE 0301869 W SE0301869 W SE 0301869W WO 2005055464 A1 WO2005055464 A1 WO 2005055464A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bler
- ber
- link
- target
- mobile
- Prior art date
Links
Classifications
-
- 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
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
-
- 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
- H04W52/20—TPC being performed according to specific parameters using error rate
Definitions
- the present invention relates to mobile uplink and downlink power control and more particularly to a block/ bit error rate (BLER/ BER) measurement for obtaining an optimum power setting.
- BLER/ BER block/ bit error rate
- WDCMA Wideband Code Division Multiple Access
- CDMA2000 code division multiple access technologies like CDMA2000
- GMSK Gaussian Minimum Shift keying and EDGE Enhanced Data rates for GSM Evolution Radio Access Network (GERAN) providing radio access with slower power control or any other modern cellular radio access.
- EDGE Enhanced Data rates for GSM Evolution Radio Access Network
- the so-called inner loop of the power control algorithm tries to keep the received signal-to-interference-ratio (SIR) at a specific level (SIR target). If SIR becomes to low the power control commands the transmitter at the other end of the link to raise its output power in order to keep SIR and thereby the quality of received signal at an acceptable level. If SIR on the other hand is too high the transmitter is commanded to lower its output power in order not to cause unnecessary interference to other users.
- SIR received signal-to-interference-ratio
- an outer loop of power control When e.g. a speech coded block is sent over the air interface cyclic redundancy checksums (CRC) are calculated on parts of the speech block. The checksums are sent together with the speech block and are being used by the receiver to detect erroneous blocks.
- the outer loop of the power control algorithm uses the block error rate measurement (BLER) to adjust the SIR target so a level that gives a specific BLER (the BLER target). If the measured BLER is lower than the BLER target, then the outer loop changes the SIR target to a lower value and if the measured BLER is higher than the BLER target, then the SIR target will be raised.
- BLER block error rate measurement
- Selecting a value for the BLER target is a trade off between quality and radio cell capacity.
- a lower BLER target gives a better speech quality, but at the expense of higher transmitter power and therefore lower cell capacity., i.e. number of simultaneous users in the cell in this radio link direction.
- Today the BLER target is set for all radio links without considering if the call is a Mobile to Public Switched Telephone Network (MTPSTN) call or if it is a Mobile to Mobile (MTM) call.
- MTPSTN Mobile to Public Switched Telephone Network
- MTM Mobile to Mobile
- MTM Mobile to Mobile
- a method and a system are disclosed for case controlled block error rate (BLER) or bit error rate (BER) target setting in a Code Division Multiple Access (CDMA) Mobile to Mobile (MTM) and Mobile to Public Switched Telephone Network (MTPSTN) communication system, whereby for instance an overall BLER/ BER target value will be defined.
- a decision is made whether the call is of the type MTM or MTPSTN. This may be done for instance by inspecting certain frame types only occurring in the downlink if there is another mobile link in the path.
- a first BLER/ BER value for the uplink or the first link is then determined by counting bad frames and using remaining difference to the overall BLER/ BER target value for the setting of the second BLER/BER value for the downlink or second link. Initially the first BLER/BER value of the uplink may be set to a maximum value equal to half the total BLER/BER target value.
- the solution of the presented problem should be to have different BLER/BER target values for mobile to PSTN calls and for Mobile to Mobile calls, the ideal solution would be to have different BLER/BER targets for each individual link (two uplinks, two downlinks) in order to achieve always the same total BLER/BER in all call cases.
- the uplink direction which is always the first radio link in this speech path direction, it is simple to detect the speech frames corrupted by this radio link: These are generally all bad frames.
- the BLER/BER is set to the desired value for the overall BLER.
- the BLER/BER for this first radio link may in a first solution be set to just the half of the desired value for the overall
- the differentiation between both error sources may be made within the mobile station based on the way the CRC calculation is defined for the downlink radio interface, see TS 48.060 or TS 48.061.
- Bad speech frames arriving by downlink at the Base Tranceiver Station (BTS) will either be replaced by "Layer 2 Fill Frames" or be sent down to the mobile station, but with inverted CRC bits.
- UMTS Universal Mobile Telecommunication System
- UTRAN Universal Mobile Telecommunication System Terrestrial Radio Access Network
- RNC Radio Network Controller
- UE User Equipment
- Node B inverts the CRC bits for bad speech frames (however this is not yet standardised).
- the BLER/BER is set to the desired value for the overall BLER/BER.
- the BLER/BER for this second radio link may in a first solution be set to just the half of the desired value for the overall BLER/BER.
- Alternative solutions to set the BLER/BER target values for Mobile to Mobile calls take advantage of the fact that the interference situations in both radio cells are typically not equal.
- what counts for the end-user is the overall BLER/BER, which must stay below a certain limit (e.g. 1%) to satisfy the end-user. But it does not matter if one radio link is completely error free (at the extreme) and the other radio link produces all the allowed errors.
- the uplink direction has to carry less overall traffic than the downlink direction (mainly due to the increasing usage of streaming data retrieval and Internet browsing) and therefore more transmitter power may be allowed to the individual uplink.
- the BLER/BER target for the uplink can be set to a lower value. It is possible that the first radio link adapts its BLER/BER target value for the uplink permanently according to the changing load and interference situation in its uplink direction.
- the second downlink can easily determine the BLER/BER from the first radio link by counting the bad frames and can then use all the remaining difference to the overall BLER/BER target for its BLER/BER target setting. In this way the load in the second cell in downlink direction can be reduced without violating the speech quality target.
- This second alternative solution is therefore the preferred one, because it optimises the critical downlink direction. It has another great advantage: It works automatically for all call types, PSTN to Mobile and Mobile to Mobile, because it just uses the remaining BLER/BER difference for its own target setting. In case of PSTN to Mobile calls the first access is typically completely error free.
- PSTN to Mobile calls the first access is typically completely error free.
- MTPSTN calls in the sense that BLER/BER target on the uplink radio channel might in average be set too low to allow the necessary headroom for a potential second downlink radio channel, but which is not present in MTPSTN calls.
- a further advantage of the second solution is that it can take into account also errors in the transmission in the fixed part of the connection. These errors are typically rare, but may increase in busy hours due to increased traffic and load (especially when packet base transport (e.g. Internet Protocol, IP or Asynchronous Transfer Mode, ATM) is used or may increase in bad weather conditions (e.g. when microwave links are used).
- packet base transport e.g. Internet Protocol, IP or Asynchronous Transfer Mode, ATM
- RAN Radio Access Network
- the implementation of the method and system according to the present inventive idea includes the planning and realisation of transcoder free operation(TrFO) or tandem free operation (TFO) where the system is aware of if a call is a Mobile to PSTN or Mobile to Mobile call. It is also possible to detect a Mobile to Mobile call by inspecting the frame type of the speech data since certain frame types (for instance SPEECHJBAD, SID_BAD) only occurs in the downlink data if there is another mobile link in the path. Another possibility to detect a Mobile to Mobile call is by number analysis, i.e. knowledge of if a called telephone number belongs to a fixed line service or a mobile telephone service. Thus, this is applicable for WCDMA and CDMA2000 and future systems that include a power control similar to WCDMA. It can also be used for other
- the basic principle of the invention is not limited to the use of the block error rate BLER to control the transmission power. It is equally applicable for other parameters like for example the bit error rate,
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003287120A AU2003287120A1 (en) | 2003-12-03 | 2003-12-02 | Call case controlled bler target setting |
US10/581,246 US20090034425A1 (en) | 2003-12-03 | 2003-12-03 | Call case controlled bler target setting |
PCT/SE2003/001869 WO2005055464A1 (en) | 2003-12-03 | 2003-12-03 | Call case controlled bler target setting |
EP03781186A EP1709751A1 (en) | 2003-12-03 | 2003-12-03 | Call case controlled bler target setting |
CNA2003801107881A CN1879313A (en) | 2003-12-03 | 2003-12-03 | Call case controlled BLER target setting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2003/001869 WO2005055464A1 (en) | 2003-12-03 | 2003-12-03 | Call case controlled bler target setting |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005055464A1 true WO2005055464A1 (en) | 2005-06-16 |
WO2005055464A8 WO2005055464A8 (en) | 2006-08-10 |
Family
ID=34651608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2003/001869 WO2005055464A1 (en) | 2003-12-03 | 2003-12-03 | Call case controlled bler target setting |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090034425A1 (en) |
EP (1) | EP1709751A1 (en) |
CN (1) | CN1879313A (en) |
AU (1) | AU2003287120A1 (en) |
WO (1) | WO2005055464A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2071737A1 (en) | 2007-12-14 | 2009-06-17 | Vodafone Group PLC | Method of management of power in UTRAN networks |
CN105025577A (en) * | 2014-04-29 | 2015-11-04 | 中国电信股份有限公司 | Long term evolution (LTE) system uplink wireless resource control method and base station |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9179333B1 (en) | 2013-08-14 | 2015-11-03 | Sprint Communications Company L.P. | Hybrid automatic repeat request block error rate control for wireless communications |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1054518A1 (en) | 1999-05-21 | 2000-11-22 | Alcatel | A method for improving performances of a mobile radiocommunication system using power control |
US20020018453A1 (en) | 2000-07-01 | 2002-02-14 | Yao Yu | Method for controlling outer loop power |
US20030036403A1 (en) | 2001-08-20 | 2003-02-20 | Shiu Da-Shan | Power control for a channel with multiple formats in a communication system |
EP1311076A1 (en) | 2001-11-12 | 2003-05-14 | Lucent Technologies Inc. | Control of the transmission power of a CMDA based system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5828672A (en) * | 1997-04-30 | 1998-10-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Estimation of radio channel bit error rate in a digital radio telecommunication network |
US6539205B1 (en) * | 1998-03-23 | 2003-03-25 | Skyworks Solutions, Inc. | Traffic channel quality estimation from a digital control channel |
US6167259A (en) * | 1998-06-19 | 2000-12-26 | Ericsson Inc. | System and method of quantifying the degree of balance on forward link and reverse link channels |
GB9923069D0 (en) * | 1999-09-29 | 1999-12-01 | Nokia Telecommunications Oy | Estimating an indicator for a communication path |
US6950402B2 (en) * | 2001-02-15 | 2005-09-27 | Persona Software, Inc. | Web-enabled call management method and apparatus |
-
2003
- 2003-12-02 AU AU2003287120A patent/AU2003287120A1/en not_active Abandoned
- 2003-12-03 CN CNA2003801107881A patent/CN1879313A/en active Pending
- 2003-12-03 EP EP03781186A patent/EP1709751A1/en not_active Withdrawn
- 2003-12-03 US US10/581,246 patent/US20090034425A1/en not_active Abandoned
- 2003-12-03 WO PCT/SE2003/001869 patent/WO2005055464A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1054518A1 (en) | 1999-05-21 | 2000-11-22 | Alcatel | A method for improving performances of a mobile radiocommunication system using power control |
US20020018453A1 (en) | 2000-07-01 | 2002-02-14 | Yao Yu | Method for controlling outer loop power |
US20030036403A1 (en) | 2001-08-20 | 2003-02-20 | Shiu Da-Shan | Power control for a channel with multiple formats in a communication system |
EP1311076A1 (en) | 2001-11-12 | 2003-05-14 | Lucent Technologies Inc. | Control of the transmission power of a CMDA based system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2071737A1 (en) | 2007-12-14 | 2009-06-17 | Vodafone Group PLC | Method of management of power in UTRAN networks |
CN105025577A (en) * | 2014-04-29 | 2015-11-04 | 中国电信股份有限公司 | Long term evolution (LTE) system uplink wireless resource control method and base station |
Also Published As
Publication number | Publication date |
---|---|
US20090034425A1 (en) | 2009-02-05 |
WO2005055464A8 (en) | 2006-08-10 |
AU2003287120A1 (en) | 2005-06-24 |
AU2003287120A8 (en) | 2005-06-24 |
CN1879313A (en) | 2006-12-13 |
EP1709751A1 (en) | 2006-10-11 |
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