CN1627676B - Channel code mapping method of down going sharing channels in broadband CDMA system - Google Patents
Channel code mapping method of down going sharing channels in broadband CDMA system Download PDFInfo
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Abstract
The disclosed method includes following steps: (1) calculating magnitude of spread spectrum factor needed for each combination of transmission format in users' combination of transmission format; (2) obtaining minimal spread spectrum factor needed by user based on calculated result; (3) selecting branch in lowest extent for multiplexing root node in code tree assigned for shared channel; (4) in selected branches, mapping each user's combination of transmission format to suitable channel code. The WCDMA system is capable of implementing mapping channel codes for down going sharing channels, taking full advantage of resources of channel codes, ensuring fairness among different users, and realizing maximal throughput of system.
Description
Technical field
The present invention relates to the method for code word mapping in the code division multiple access system, particularly a kind of channel code mapping method of down channel.
Background technology
3-G (Generation Three mobile communication system) on physical channel, need be carried out spread processing based on code division multiple access (Code Division Multiple Access is called for short " CDMA ") technology to data.Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short " WCDMA ") be 3G (Third Generation) Moblie (the 3rd Generation, abbreviation " 3G ") three kinds of mainstream standard is a kind of, it has inherited existing global system for mobile communications (Global Systems for Mobilecommunications, be called for short " GSM ") the high and open good characteristics of standardization level, with the GSM network favorable compatibility and interoperability being arranged, is one of development trend of future mobile communications.
In the WCDMA system, data need to carry out channelisation operation before transmission, promptly by multiplying each other with channel code each data symbol are converted to some chips, have therefore increased the bandwidth of signal, have promptly expanded the frequency spectrum of signal.Channel code is Orthogonal Variable Spreading Factor OVSF (Orthogonal Variable SpreadingFactor, be called for short " OVSF ") sign indicating number, is used to keep the orthogonality between user's different channels.The number of chips of each data symbol conversion is called spreading factor (Spreading Factor is called for short " SF "), and promptly the length of channel code is represented with SF.The magnitude range of SF from 4 to 512, but must be 2 integer power.SF is more little, and the number of chips of each data symbol conversion is more little, and corresponding bandwidth is big more.
Above-mentioned ovsf code as channel code can define with code tree as shown in Figure 1.Channel code be defined as C (SF, k), wherein SF is a spreading factor, k be the sign indicating number sequence number, 0≤k≤SF-1.Each of code tree grade definition length is the channel code of SF, and the leftmost value of each channel code word is corresponding to the chip of launching the earliest.
In the WCDMA mobile communication system, there is a kind of channel to be shared, promptly so-called DSCH Downlink Shared Channel (Downlink Shared Channel is called for short " DSCH ") by a plurality of user in the sub-district.This channel only just has in down link, by sharing of a plurality of users, reaches that code word in the system is multiplexing, the purpose of raising system throughput.
Except power resource, use the user of shared channel, what in fact share is the channel code resource that assigned for shared channel is used in the system.The channel code resource of assigned for shared channel is different and different according to the system design demand, but can only be less than channel code resource total in the system.Under the control of certain dispatching algorithm, use the user of shared channel to divide with time-division, sign indicating number, perhaps the time-division utilizes the channel code that obtains to carry out transfer of data in conjunction with the dynamic right to use that obtains certain channel code of mode that sign indicating number divides then.
Dispatching algorithm has determined each to use the user of shared channel when to transmit data with great speed.According to the scheduling result of dispatching algorithm, the data that the user can be transmitted in difference constantly are variable, can be that unit changes with 10 milliseconds the soonest.Therefore, dispatching algorithm is to user's rate scheduling, and just the channel code resource that shared channel is used is distributed to part or all among the user who uses shared channel in a dynamic way.Wherein, each user's transport format combination set (TransportFormat Combination Set, be called for short " TFCS ") middle transformat combination (the Transport Format Combination that preserves this user's correspondence, be called for short " TFC ") information, can determine the size of the needed bandwidth of user and then definite spreading factor SF by these information.Minimal frequency spreading factor is the minimum value in all spreading factors of each TFC of respective user, and TFC that should minimal frequency spreading factor is called maximum TFC.
For a user who uses shared channel, the channel code of using in communication process is dynamic change, in order can correctly to receive signal at receiving terminal, must come to give the recipient corresponding relation prior notice between different rates and the channel code by certain mode, in the WCDMA system, such corresponding relation is called code word mapping relations (code mapping).
The channel code mapping is a key technology that realizes DSCH Downlink Shared Channel.Dispatching algorithm except each user's data amount, priority, also needs to consider pre-configured channel code mapping relations when carrying out data dispatch.Therefore, the quality of the channel code mapping relations of configuration has influenced the performance of dispatching algorithm to a great extent, thereby has influence on the maximum throughput rate of system, and the fairness between the user.
According to the method for expressing of channel code mapping in the WCDMA protocol specification, can realize the channel code mapping flexibly according to different principles.
In actual applications, there is following problem in such scheme: in existing WCDMA protocol specification, only stipulated the method for expressing of channel code mapping, but do not had the specific implementation method of predetermined channel sign indicating number mapping.Because the realization of shining upon for the channel code of WCDMA system also is in development mostly, therefore goes back the method for neither one realization code word mapping at present and on disclosed paper or periodical, deliver.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of channel code mapping of broadband CDMA system DSCH Downlink Shared Channel, make the channel code that in the WCDMA system, can realize DSCH Downlink Shared Channel shine upon, when making full use of the channel code resource, guarantee the fairness between the different user, realize the maximum throughput rate of system.
In order to solve the problems of the technologies described above, the invention provides a kind of method of channel code mapping of broadband CDMA system DSCH Downlink Shared Channel, comprise following steps:
A calculates the size of the needed spreading factor of each transformat combination in user's transport format combination set;
B obtains the needed minimal frequency spreading factor of described user according to described result calculated;
C selects the minimum branch of extent for multiplexing root node according to described minimal frequency spreading factor in distributing to the code tree of described shared channel;
D is mapped to suitable channel code with each transformat combination of described user in described selecteed branch.
Wherein, utilize the multiplexing coefficient of channel code to represent the extent for multiplexing of channel code;
When a transformat combination was mapped to a channel code or is mapped to father's sign indicating number of this channel code, the multiplexing coefficient of this channel code improved 1 unit.
Described step C comprises following substep:
C1 obtains the multiplexing coefficient of each channel code in the preceding described code tree of new subscriber access system;
C2 selects all spreading factors to equal the channel code of described minimal frequency spreading factor as the candidate channel code in described code tree;
C3 selects to have the channel code of minimum multiplexing coefficient in described candidate channel code;
C4 is the branch as described user's correspondence of the branch at selecteed channel code place, and the root node of this branch is shone upon maximum tfc to described user.
Described step D further comprises following substep:
All transformat combination that D1 will need to shine upon are according to spreading factor rank order from small to large;
D2 obtains a described transformat combination successively, judge the spreading factor size of this transformat combination, if it is less then this transformat combination is mapped to a channel code on described user's respective branches, determine a littler branch with this channel code, if big then this transformat combination is mapped to specific channelization code on the described more subbranch.
Described step D2 also further comprises step quickly:
During the channel code of shining upon for transport format combination selection, in all optional channel code, select a minimum channel code of extent for multiplexing.
The extent for multiplexing of representing channel code with the number that maps directly to the transformat combination on the channel code.
In described step D, as much as possible all transformat combination of a user all are mapped in the channel code branch.
By relatively finding, technical scheme difference with the prior art of the present invention is, the present invention proposes the minimum multiplexing principle of channel code, according to the multiplexing principle of minimum, all transformat combination with a user all are mapped in the channel code branch as far as possible, realize the channel code mapping of DSCH Downlink Shared Channel thus in the WCDMA system.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly at first, the present invention program is mapped to all transformat combination of a user in the channel code branch as far as possible, has therefore improved the utilization ratio of the channel code of assigned for shared channel to a greater extent; Secondly, for each user, the present invention program is all shone upon the channel code of multiplexing coefficient minimum to this user, can effectively keep the fairness aspect use channel code resource between the user; The 3rd, because the present invention has improved the utilization ratio of channel code, therefore provide higher throughput and capacity for system.
Description of drawings
Fig. 1 is the code tree definition as the orthogonal variable frequency extension factor code of channel code;
Fig. 2 is the schematic diagram according to channel code mapping in the channel code mapping method of realizing DSCH Downlink Shared Channel in the WCDMA system of a preferred embodiment of the present invention;
Fig. 3 is the flow chart of realizing the channel code mapping method of DSCH Downlink Shared Channel in the WCDMA system according to a preferred embodiment of the present invention;
Fig. 4 is for determining the sub-process schematic diagram of user corresponding branch in code tree according to the minimum multiplexing principle of the utilization of a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention realizes the channel code mapping method of DSCH Downlink Shared Channel based on the multiplexing principle of minimum channel code in the WCDMA system, guarantee the fairness between the different user when making full use of the channel code resource, realizes the maximum throughput rate of system.Basic ideas of the present invention are, with the multiplexing coefficient of channel code the extent for multiplexing of user to channel code described, when a TFC is mapped to the spreading code that has a certain size spreading factor in the code tree, from the code word of candidate, select to have the code word of minimum extent for multiplexing.The present invention adopts the multiplexing coefficient of channel code to represent the extent for multiplexing of user to each channel code.
In a preferred embodiment of the present invention, the multiplexing coefficient of channel code is meant the number of times that a specific code word is repeated to use, and when a TFC was mapped to this code word or be mapped to father's sign indicating number of this code word, the multiplexing coefficient of this code word all improved " 1 " individual unit.
In another embodiment of the present invention, the multiplexing coefficient of channel code also can be defined as the number that maps directly to a TFC above the specific code word.
Below in conjunction with a preferred embodiment of the present invention the present invention program is described.
In a preferred embodiment of the present invention, the schematic diagram of channel code mapping as shown in Figure 2.
Sometime, the TFC1～TFC5 from identical or different user in the sub-district is mapped to channel code 1～5 respectively.For channel code 1, have only TFC1 just can use it; For channel code 2, though have only TFC2 to be mapped to it because channel code 1 is father's sign indicating number of channel code 2, thus when TFC1 in use channel code 1 time channel code 2 can not be used by other user.And the like, the multiplexing coefficient that obtains the different channels sign indicating number is as shown in the table.
| Channel code | TFC1 | TFC2 | TFC3 | TFC4 | TFC5 | TFC6 | The multiplexing coefficient of channel code |
| 1 | √ | 1 | |||||
| 2 | √ | √ | 2 | ||||
| 3 | √ | √ | √ | 3 | |||
| 4 | √ | √ | √ | √ | 4 | ||
| 5 | √ | 1 | |||||
| 6 | √ | 1 | |||||
| 7 | √ | √ | 2 |
The present invention based on minimum multiplexing principle, in the channel code of candidate, select a channel code exactly with minimum multiplexing coefficient.
In a preferred embodiment of the present invention, the flow process of the channel code mapping method of realization DSCH Downlink Shared Channel as shown in Figure 3 in the WCDMA system.
At first enter step 100,, calculate and obtain the length of the needed channel code of each TFC, i.e. the size of spreading factor according to the TFC information among the user TFCS.Wherein, Calculation Method is carried out according to related content multiplexing about transmission channel in the WCDMA agreement and coding.
Then enter step 200, in this step, obtain the needed minimal frequency spreading factor of this user according to the result of calculation of step 100.As described in the background art, the minimum value in all spreading factors of each TFC of minimal frequency spreading factor respective user, the TFC of corresponding minimal frequency spreading factor is called maximum TFC.Wherein, if there are a plurality of TFC all to need minimal frequency spreading factor, these several TFC can regard maximum TFC as.Then enter step 300.
In step 300,, utilize minimum multiplexing principle to determine the branch of this user correspondence in code tree according to the minimal frequency spreading factor of user's needs.In particular, step 300 can also be divided into following substep, in a preferred embodiment of the present invention, utilizes flow chart that minimum multiplexing principle determines this user corresponding branch in code tree as shown in Figure 4.
At first enter step 310, obtain the multiplexing coefficient of each channel code in the preceding code tree of new subscriber access system; Then enter step 320, in the code tree of assigned for shared channel, the channel code that spreading factor is equaled minimal frequency spreading factor is all as the channel code of candidate; Then enter step 330, in the channel code of candidate, select a channel code with minimum multiplexing coefficient; Then enter step 340, with the branch as this user's correspondence of the branch at selecteed channel code place, with the channel code of spreading factor minimum in this branch, promptly the root of branch shines upon the maximum TFC to this user.
After finishing above-mentioned steps 300, then enter step 400,, select suitable channel code to shine upon other TFC to the user according to the multiplexing principle of minimum.Those of ordinary skill in the art are appreciated that in order to improve the utilization ratio of channel code, should be mapped to all TFC of a user in the branch as much as possible.In a preferred embodiment of the present invention, adopt a kind of simple method to come performing step 400, size according to the spreading factor of TFC correspondence, first TFC corresponding little spreading factor is mapped to certain channel code on this user's respective branches, this channel code has just been determined a littler branch, then the TFC of the big spreading factor of correspondence is mapped to this more specific channelization code on the subbranch.Repeat such step, all be mapped to specific code word up to all TFC the user.
By above-mentioned steps, in the WCDMA system, realize the channel code mapping of DSCH Downlink Shared Channel.
Those of ordinary skill in the art are appreciated that, if there are a plurality of TFC all to need minimal frequency spreading factor, a plurality of maximum TFC are promptly arranged, for each maximum TFC, in step 300, according to the minimal frequency spreading factor of user's needs, utilize minimum multiplexing principle to determine the branch of each maximum TFC correspondence in code tree.The combination of these branches does not influence realization of the present invention as the branch of user's correspondence in code tree.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (3)
1. the method for the channel code of broadband CDMA system DSCH Downlink Shared Channel mapping is characterized in that, comprises following steps:
A calculates the size of the needed spreading factor of each transformat combination in user's transport format combination set;
B obtains the needed minimal frequency spreading factor of described user according to described result calculated;
C1 obtains the multiplexing coefficient of each channel code in the preceding code tree of subscriber access system;
C2 selects all spreading factors to equal the channel code of described minimal frequency spreading factor as the candidate channel code in described code tree;
C3 selects to have the channel code of minimum multiplexing coefficient in described candidate channel code;
C4 is the branch as described user's correspondence of the branch at selecteed channel code place, and the root node of this branch is shone upon maximum tfc to described user;
D is mapped to the channel code corresponding with the spreading factor of described each transformat combination with each transformat combination of described user in described selecteed branch.
2. the method for the channel code mapping of broadband CDMA system DSCH Downlink Shared Channel according to claim 1 is characterized in that, represents the extent for multiplexing of channel code with the number that maps directly to the transformat combination on the channel code.
3. the method for the channel code mapping of broadband CDMA system DSCH Downlink Shared Channel according to claim 1 is characterized in that, in described step D, all transformat combination of a user all is mapped in the channel code branch.
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| CN101001137B (en) * | 2006-01-12 | 2012-07-04 | 北京三星通信技术研究有限公司 | Equipment and method for supporting multi-consumer reuse |
| WO2007107089A1 (en) * | 2006-03-17 | 2007-09-27 | Huawei Technologies Co., Ltd. | System for minimizing signaling overhead in ofdma-based communication systems |
| CN101123479B (en) * | 2006-08-11 | 2011-05-11 | 中兴通讯股份有限公司 | A minimal frequency spreading factor reconfiguration method for special uplink channel |
| CN101123600B (en) * | 2006-08-11 | 2012-01-11 | 华为技术有限公司 | Orthogonal frequency division multi-address access system and its device, transmission method and terminal |
| CN101321373B (en) * | 2007-06-07 | 2012-10-03 | 华为技术有限公司 | Measurement reporting and load control method and device for minimum channel code requirement |
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| CN1363144A (en) * | 2000-02-17 | 2002-08-07 | 三星电子株式会社 | Apparatus and method for assigning common packet channel in CDMA communication system |
| CN1374772A (en) * | 2001-03-14 | 2002-10-16 | 上海大唐移动通信设备有限公司 | Bandspread distributing method in wideband CDMA system |
| CN1413393A (en) * | 1999-12-21 | 2003-04-23 | 艾利森电话股份有限公司 | Methods and apparatus for spreading and despreading information signals in CDMA communications system |
| CN1423911A (en) * | 2000-03-15 | 2003-06-11 | 诺泰网络有限公司 | Method for transmitting radio signals, radio communication access network and terminal using same |
| WO2003052985A1 (en) * | 2001-12-18 | 2003-06-26 | Telecom Italia S.P.A. | Method for code re-allocation in telecommunication systems, related system and computer product |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1413393A (en) * | 1999-12-21 | 2003-04-23 | 艾利森电话股份有限公司 | Methods and apparatus for spreading and despreading information signals in CDMA communications system |
| CN1363144A (en) * | 2000-02-17 | 2002-08-07 | 三星电子株式会社 | Apparatus and method for assigning common packet channel in CDMA communication system |
| CN1423911A (en) * | 2000-03-15 | 2003-06-11 | 诺泰网络有限公司 | Method for transmitting radio signals, radio communication access network and terminal using same |
| CN1374772A (en) * | 2001-03-14 | 2002-10-16 | 上海大唐移动通信设备有限公司 | Bandspread distributing method in wideband CDMA system |
| WO2003052985A1 (en) * | 2001-12-18 | 2003-06-26 | Telecom Italia S.P.A. | Method for code re-allocation in telecommunication systems, related system and computer product |
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