CN1295897C - Method for obtaining down high-speed data transmission parameter in time division duplex system - Google Patents
Method for obtaining down high-speed data transmission parameter in time division duplex system Download PDFInfo
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- CN1295897C CN1295897C CNB011386266A CN01138626A CN1295897C CN 1295897 C CN1295897 C CN 1295897C CN B011386266 A CNB011386266 A CN B011386266A CN 01138626 A CN01138626 A CN 01138626A CN 1295897 C CN1295897 C CN 1295897C
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Abstract
The present invention discloses a method for obtaining parameters of downlink high-speed data transmission in a time division duplex system. The method comprises the steps that (a) user equipment (UE) measures the signal-to-interference ratio (SIR) for the channel quality of a high-speed downlink data channel to obtain the SIR value; (b) a modulation coding scale (MCS) which needs to be used currently, the number of code words, and the number of time slots is determined by the UE according to the measured SIR value; meanwhile, the UE checks a data receiving block; (c) the UE feeds back the obtained MCS, the number of code words, the number of time slots and checking results together with transmitting power control to a base station; (d) the base station makes a comprehensive plan according to the information of the MCS, the number of code words, and the number of time slots, which are uploaded by all the UE of a current cell so as to determine the MCS, the number of code words and the number of time slots, which are available to the current UE; and results are transferred to the UE which processes the data according to the information. The method has the advantages of certain selecting autonomy of the UE, accurate selection of the parameters of downlink high-speed data transmission, uplink resource saving, and enhanced stability and efficiency of the system.
Description
Technical field
The present invention relates to a kind of method for selecting of downlink data transmission parameter, be meant especially in time division duplex (TDD) system, a kind of by the selected voluntarily earlier downlink transfer parameter of UE, and pass to the base station reference, the method that the downlink data transmission parameter that the base station finally makes a policy by unified plan is again selected.
Background of invention
Along with reaching its maturity of 3G (Third Generation) Moblie (3G) technology, and the expansion day by day of range of application, on the basis of original technology, constantly there is new expansion enhancement techniques to propose.At present, in the enhancement techniques of 3-G (Generation Three mobile communication system), proposed a kind of method of high speed data transfer, be called the high-speed downstream bag and insert (HSDPA).In existing TDD system high-speed transfer of data, for the feedback content of up signaling, promptly subscriber equipment (UE) sends in the feedback parameter of base station and mainly comprises: be used to represent sign A CK/NACK, signal interference ratio (SIR) and transmission power control (TPC) that data packet transmission is whether successful.The sir value that feeds back to the base station in the existing HSDPA technology is to after channel quality measures in the down high speed transmission channel that is received by UE, be transferred to the base station by up channel again, after this sir measurement value is received in the base station, will come determine and be provided with modulating-coding progression (MCS) that downlink transmission data will adopt, take timeslot number and available codes number of words according to this value.
But, because prior art UE can not accomplish very accurate to the measured value of SIR, the channel transmission quality of adding the up-downgoing interchannel is incomplete same again, certain error is promptly arranged, so, if this sir value that the base station reports according to UE is determined MCS that down-transmitting data will adopt, is taken timeslot number and code word number, to be more inaccurate, like this, will influence the transmission quality of whole system downlink data, and then cause the system service quality to descend.And the SIR that only upload according to each UE the base station causes the unreasonable distribution of base station to whole local resource possibly as the decision condition of its Resources allocation.In addition, because the sir value that the base station will utilize UE to upload decides parameters such as MCS, timeslot number and code word number, therefore require the sir value of transmission accurate more good more, and the SIR of transmission is accurate more, shared transmitted bit is just many more, so, the uplink transmission resource that not only takies is many, and, in case pass wrong, just will cause the parameters such as MCS of base station selected mistake, and cause UE when downlink data receiving, to make a mistake.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method that down high-speed data transmission parameter obtains in a kind of tdd systems, make it can give the certain selection autonomy of UE, and then the parameter that makes down-transmitting data is selected more accurate, simultaneously can save uplink transmission resource, improve the stability and the efficient of whole system.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
The method that down high-speed data transmission parameter obtains in a kind of tdd systems, be applicable to the communication system of supporting the high-speed downstream bag to insert and adopt hybrid automatic repeat request technology and cyclic redundancy check (CRC) technical identification transmission of data blocks correctness, key is that this method comprises, in subscriber equipment (UE) side and base station side the corresponding relation of identical signal interference ratio (SIR) and modulating-coding rank (MCS) is set, this method also comprises the steps:
A.UE carries out sir measurement to the channel quality of the high-speed down data channel that receives, obtains current sir value;
The sir value that b.UE records according to step a is determined current modulating-coding rank (MCS), code word number and the timeslot number that should use, and determined MCS, code word number and timeslot number are sent to the base station by up signaling channel;
C. after received the base station, MCS, code word number and timeslot number information and each user's who uploads according to all UE of current area subordinate priority level was determined the spendable MCS of current UE, code word number and timeslot number; And the spendable MCS of determined current UE, code word number and timeslot number information passed to current UE by downlink signaling.
The setting of described SIR and MCS mapping table is obtained by the system emulation test, or is recorded by system experimentation, or is obtained by empirical value.The corresponding relation of described SIR of setting and MCS is: the mapping table that SIR and MCS are set.
Step b is described to determine that the current MCS that should use is specially: after UE measures sir value, search set SIR and the mapping table of MCS, obtain the MCS value of current SIR correspondence.
Selecting of described code word number and timeslot number is relevant with value and the traffic needs of signal interference ratio SIR.The MCS that upload according to all UE of current area subordinate the base station among the step c, code word number and timeslot number information and each user's priority level and with the far and near distance of base station, determine the spendable MCS of current UE, code word number and timeslot number.
By such scheme as can be seen, key of the present invention is: UE does not pass parameter S IR in up signaling, but by the sir value of UE by measurement down high speed transmission channel, the MCS that will adopt when deciding downlink data transmission earlier, code channel number and timeslot number, and then with self-determining parameter MCS, code channel number, timeslot number and be uploaded to the base station, MCS, code channel number and timeslot number that the base station will be uploaded with all subordinate UE are as important reference, unified plan determines to pass down parameter MCS, code channel number and timeslot number at last, to improve the stability and the reliability of system.
Therefore, the method that down high-speed data transmission parameter obtains in the tdd systems provided by the present invention has following advantage and characteristics:
1) the present invention elder generation, is selected MCS, timeslot number and code word number and passes to the base station as a reference according to measured sir value by UE, after the parameter of all UE being uploaded by the base station is taken all factors into consideration again, determines the parameter value that should select at last.Like this, give on the one hand the certain selection autonomy of UE, determining MCS, code word number and timeslot number by SIR as one of ability of UE, UE oneself decision needs the downlink transfer parameter used, and the higher and complexity increase of accuracy not quite; Also make on the other hand and more suitably select important reference frame is provided, make decision jointly by both party in fact, more help improving the reliability and the applicability of decision-making, and then improve the stability and the efficient of whole system for the base station.
2) prior art need quantize at transmission SIR, but quantizes to which kind of degree, all is uncertain with several bits, the precision that quantizes is high more, and the bit number that needs is many more, and bit number more than not only takies resource, and how to guarantee that transmission does not produce mistake, also be very big problem.Among the present invention, because UE do not pass SIR in up signaling, and change transmission parameter MCS, timeslot number and code word number into, the shared bit number of these three parameters is less and very fixing.So, not only can save taking of uplink transmission resource, and can avoid improving the accuracy of downstream parameter because falsely dropping of causing of SIR erroneous transmissions selected parameter.
Description of drawings
Fig. 1 is for adopting the inventive method TDD uplink signalings structural representation;
The flow chart that Fig. 2 realizes for the inventive method.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
In the TDD system, adopt the inventive method UE as shown in Figure 1 to the up signaling structure of base station transmits, Fig. 1 explanation: comprise data field 1 (Data1), pilot field (Midamble), TPC territory and data field 2 (Data2) in the existing up signaling, so, judge parameter A CK/NACK, MCS, timeslot number and the code word number that draws by UE, can do as a whole insertion Data1 territory or Data2 territory according to practical situations, or segmentation is inserted simultaneously in Data1 and the Data2 territory and is transmitted.
The prerequisite that present embodiment is realized is: this communication system is supported high speed transmission HSDPA technology, and the inventive method is applicable to the TDD system, the characteristics of TDD system are user time-sharing crack transmission data, and the operable modulating-coding progression of user, timeslot number and code word number are all determined by the base station.Simultaneously, set this system and adopt mixed automatic repeat requests (HARQ) technology, and the correctness of employing Cyclic Redundancy Check technical identification transmission of data blocks, CRC check result uploads the signaling sign by ACK/NACK, ACK represents the transmission of data blocks success, and NACK represents the transmission of data blocks failure.In addition, requiring all has identical SIR and the corresponding relation of MCS in the base station with UE both sides, and wherein, SIR is that UE is by measuring the resulting signal interference ratio of high-speed down data channel; MCS is the operable modulating-coding progression of system default.
Referring to shown in Figure 2, the detailed process that the present invention realizes is such:
1) base station sends data on the high-speed down data channel, and the channel quality of the high-speed down data channel that the UE basis receives carries out sir measurement and obtains sir value.
2) UE determines the current MCS that should use according to the sir value that records, and the code word number and the timeslot number that need use.Wherein, MCS provisioning request really sets in advance the mapping table of a SIR and MCS in UE, UE searches corresponding M CS according to sir value at every turn in table, and being provided with generally of this correspondence table obtained by the system emulation test, or record, or obtain by empirical value by system experimentation; The measured value of the definite and SIR of code word number and timeslot number is relevant with the demand of traffic carrying capacity.
3) simultaneously, UE carries out CRC check to the data block that receives, if this transmission of data blocks correctly then obtain ACK, otherwise obtains NACK.
4) UE feeds back to base station together with TPC by up signaling channel with gained parameter MCS, code word number, timeslot number and ACK/NACK.
5) after received the base station, the operable MCS of this UE, code word number and timeslot number were determined in the planning of the informix of MCS, code word number and the timeslot number of uploading according to current this sub-district all UE of subordinate.So-called unified plan is meant the priority level of at first considering each user, and promptly which user has the requirement of Priority Service or which user to give someone extra help or the like; And then consideration active user's far and near distance, because under the essentially identical situation of condition,, the near user of distance provides service reliability, stability and accuracy height than user for distance for providing service.
6) base station MCS, code word number and timeslot number that determined transmission down high-speed data will be used passed to UE by downlink signaling, and parameter information that UE passes down according to the base station and the relevant signaling that relates to demodulation are come demodulating data.
7) repeat above steps.Because the present situation of user is a real-time change, the variation of monitoring SIR, and then used MCS, code word number and the timeslot number of definite downlink transfer in real time is to guarantee reliability, stability and the accuracy of transmission quality.
Claims (7)
1, the method that down high-speed data transmission parameter obtains in a kind of tdd systems, be applicable to the communication system of supporting the high-speed downstream bag to insert and adopt hybrid automatic repeat request technology and cyclic redundancy check (CRC) technical identification transmission of data blocks correctness, it is characterized in that, in user equipment (UE) side and base station side the corresponding relation of identical signal interference ratio SIR and modulating-coding rank MCS is set, this method also comprises the steps:
A.UE carries out sir measurement to the channel quality of the high-speed down data channel that receives, obtains current sir value;
The sir value that b.UE records according to step a is determined the current MCS that should use, code word number and timeslot number, and determined MCS, code word number and timeslot number are sent to the base station by up signaling channel;
C. after received the base station, MCS, code word number and timeslot number information and each user's who uploads according to all UE of current area subordinate priority level was determined the spendable MCS of current UE, code word number and timeslot number; And the spendable MCS of determined current UE, code word number and timeslot number information passed to current UE by downlink signaling.
2, method according to claim 1 is characterized in that, the setting of described SIR and MCS corresponding relation is obtained by the system emulation test, or is recorded by system experimentation, or is obtained by empirical value.
3, method according to claim 1 and 2 is characterized in that, the corresponding relation of described SIR of setting and MCS is: the mapping table that SIR and MCS are set.
4, method according to claim 3 is characterized in that, step b is described to determine that the current MCS that should use is specially: after UE measures sir value, search set SIR and the mapping table of MCS, obtain the MCS value of current SIR correspondence.
5, method according to claim 1 is characterized in that, selecting of described code word number is relevant with value and the traffic needs of signal interference ratio SIR.
6, method according to claim 1 is characterized in that, selecting of described timeslot number is relevant with value and the traffic needs of signal interference ratio SIR.
7, method according to claim 1, it is characterized in that, the MCS that upload according to all UE of current area subordinate the base station among the step c, code word number and timeslot number information and each user's priority level and with the far and near distance of base station, determine the spendable MCS of current UE, code word number and timeslot number.
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| CNB011386266A CN1295897C (en) | 2001-12-28 | 2001-12-28 | Method for obtaining down high-speed data transmission parameter in time division duplex system |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1965513B (en) | 2004-05-01 | 2014-11-26 | 桥扬科技有限公司 | Method and apparatus for communicating in time division duplex |
| UA92899C2 (en) * | 2004-10-20 | 2010-12-27 | Конинклийке Филипс Электроникс Н.В. | System and apparatus for dynamically selecting the data rate and transmit power using uwb mac-protocol |
| CN100505606C (en) * | 2004-12-17 | 2009-06-24 | 中兴通讯股份有限公司 | Self-adaptive code modulating method |
| CN100449979C (en) * | 2005-07-01 | 2009-01-07 | 上海原动力通信科技有限公司 | Method for supporting multi-stage modulation by controlling high-speed down-converter grouped access system |
| CN101043500B (en) * | 2006-06-15 | 2010-05-12 | 华为技术有限公司 | Method for Determining Reverse Data Modulation and Coding Mode and Its Access Terminal |
| CN101150344B (en) * | 2006-09-22 | 2011-07-20 | 上海无线通信研究中心 | A downlink multi-stream modulation coding mode selection and power load method |
| CN101212249B (en) * | 2006-12-29 | 2011-08-24 | 中兴通讯股份有限公司 | Method and system for improving uplink feedback capability of TDD system |
| CN101212251B (en) * | 2006-12-30 | 2011-12-28 | 中兴通讯股份有限公司 | Method and system for improving downlink feedback capability of TDD system |
| CN101222249B (en) * | 2007-01-10 | 2012-07-04 | 中兴通讯股份有限公司 | Closed-loop power controller and its control method |
| CN101355795B (en) * | 2007-07-24 | 2013-06-19 | 夏普株式会社 | Self-adapting method for judging feedback resource block number of down link |
| CN101557249B (en) * | 2008-04-07 | 2012-11-07 | 上海贝尔阿尔卡特股份有限公司 | Method and device for controlling cooperative transmission of downlink signal in wireless communication system |
| CN101527954B (en) * | 2009-04-20 | 2012-03-28 | 北京天碁科技有限公司 | Method for radio frequency control dispatching and mobile terminal thereof |
| CN105024785B (en) * | 2014-04-30 | 2019-02-26 | 普天信息技术有限公司 | Determine the method and system of downlink MCS |
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